Create Custom GPT to Help Write Newsletters Editors Would Approve

‍Create Custom GPT to Help Write Newsletters, What It Means?

Marketers spend hours every week drafting newsletters, yet 70% of subscribers say they ignore most brand emails. That gap isn’t about volume, it’s about relevance, and that’s where Custom GPTs change the game.

They help you create content that’s faster, sharper, and tailored to what your audience actually wants to read.

A Custom GPT is a specialized version of a large language model designed for a specific task or purpose. Instead of a general-purpose AI, you tailor the GPT with specific instructions, knowledge, and actions. This specialization allows it to generate content that is highly relevant and structured for a particular use case, like creating newsletters.

• Use Cases in Newsletter Marketing: Custom GPTs can handle various tasks in newsletter marketing. They can generate personalized content for different audience segments, draft entire newsletter articles based on a set of provided links or topics, and even create subject lines and calls to action. This automation streamlines the entire content creation workflow, making it more efficient.
• Why U.S. Businesses Need This: For U.S. businesses, a custom GPT helps them stay competitive in a crowded market. It allows for the rapid creation of high-quality, engaging content that keeps subscribers interested. Furthermore, it helps companies maintain a consistent brand voice across all communications, which is crucial for building trust and brand loyalty with a U.S. audience.

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Table of Contents:

• Benefits of Using a Custom GPT for Email Marketing
• Custom GPT for Creating HTML and CSS Content
• Connect Pabbly to a Custom GPT
• Set Up Custom ChatGPT Service for an Institutional Handbook
• Custom GPT for SEO in Newsletters
• Best Practices for Building Custom GPT Newsletters
• Best GPT-Compatible KYC & AI Agent Solutions
• Custom GPT for Content Creation
• How to make money with GPT's?
• How to use Chatgpt for Email Writing?
• What are the Top Email Marketing Platforms with Custom AI Agents?

Benefits of Using a Custom GPT for Email Marketing

Using a custom GPT specifically for email marketing offers significant advantages that can boost the effectiveness of your campaigns.

• Time Savings: A custom GPT drastically reduces the time and effort needed to create email content. It can quickly generate drafts, headlines, and entire email bodies, freeing up marketing teams to focus on strategy, analysis, and campaign optimization. This automation leads to faster campaign execution.
• Personalization at Scale: Custom GPTs can generate personalized content for thousands of subscribers simultaneously. By analyzing data like purchase history, interests, or location, the GPT can create emails that feel unique to each recipient. This level of personalization significantly increases open rates, click-through rates, and overall engagement.
• Consistency in Tone: A custom GPT is trained to adhere to a specific brand voice and tone. It ensures that every email, from a promotional message to a transactional notification, maintains a consistent personality. This uniformity strengthens brand identity and makes communications more professional and trustworthy.

Custom GPT for Creating HTML and CSS Content

Beyond generating text, a custom GPT can be an invaluable tool for creating the technical foundation of emails, HTML and CSS.

• How GPT Generates HTML Templates: A custom GPT can be instructed to generate clean, well-structured HTML code. You can provide a brief description of the layout you want, and the AI will produce the necessary code. It can also generate basic CSS for styling, such as colors, fonts, and spacing, based on your brand guidelines.
• Email Design Best Practices for U.S. Audiences: When generating HTML, the GPT can be trained on best practices for U.S. audiences. This includes creating simple, clean designs that are easy to read and navigate on both desktop and mobile devices. It can ensure the use of standard fonts and colors that are widely supported.
• Example: Responsive Layouts: A custom GPT can be specifically trained to generate responsive email layouts. This means the AI can write code that automatically adjusts the email's design to fit the screen size of the viewer's device, whether they are using a smartphone, tablet, or desktop computer. This is a critical feature for reaching the majority of modern email users in the U.S.

✨ You’ve seen how GPT can generate HTML emails and integrate with Pabbly. But every brand needs a tailored AI model.

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Connect Pabbly to a Custom GPT

Connecting Pabbly to a Custom GPT allows you to automate complex workflows that combine the power of AI with various business applications.

This integration streamlines tasks and boosts efficiency.

Step-by-step Integration:

• Start by creating a new workflow in your Pabbly Connect account.
• Choose a Trigger app that initiates the workflow, such as a form submission tool or a CRM.
• Next, add an Action step and select "API" or "Webhook" as the app. This is where you'll input the API endpoint for your Custom GPT.
• Configure the API call by passing the necessary data, such as a text prompt or input, to the GPT.
• Once connected, you can add further action steps to automate the rest of your process.

Automating Workflows (Draft → Approval → Send):

• This integration can automate a content creation pipeline.
• A new draft request in a Google Sheet (the trigger) sends a prompt to your Custom GPT via Pabbly.
• The GPT generates the content, which Pabbly then sends to a team member in a messaging app like Slack for approval.
• Once approved, Pabbly can automatically send the final content to its destination, such as a content management system or an email marketing tool.

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Real-world Example for U.S. SMBs:

• A small marketing agency can use this integration to automate client report generation.
• A form submission (the trigger) with client details sends a prompt to a Custom GPT.
• The GPT generates a detailed, customized report summary based on the prompt.
• Pabbly then sends the summary to the client via email and adds a copy to a Google Drive folder for record-keeping. This saves hours of manual work.

Set Up Custom ChatGPT Service for an Institutional Handbook

Creating a Custom ChatGPT for an institutional handbook transforms a static document into an interactive, 24/7 resource. This service makes information more accessible and reduces the workload on staff.

Why Schools, Universities, and Businesses Benefit:

• Schools and Universities can use it to create a help desk for student handbooks, academic policies, or admissions FAQs. This provides instant answers without needing staff intervention.
• Businesses can use it for employee handbooks, HR policies, and onboarding guides. New hires can quickly find answers to common questions, streamlining the onboarding process.
• The service improves information access and consistency while reducing repetitive inquiries to support staff.

Use Cases: Handbooks, Policies, Onboarding Guides:

• Instead of sifting through long documents, users can simply ask questions in natural language.
• For example, a student could ask, "What is the policy for requesting an academic leave?" and the bot would provide the exact information.
• A new employee could ask, "How do I request a day off?" and the bot would walk them through the specific steps outlined in the HR policy.

Example Workflow:

• Training the GPT: A custom GPT is trained on the institution's handbook and policy documents.
• Deployment: The bot is embedded on the institution's website or an internal portal.
• User Interaction: A user asks a question. The GPT references the trained documents to formulate a response.
• Maintenance: The institution can periodically upload updated policy documents to keep the bot's knowledge base current.

Schools, universities, and enterprises are already saving 40% on content costs with our custom GPT solutions.

Ready to join them? [Request a Use Case Demo →]

Custom GPT for SEO in Newsletters

Using a Custom GPT for newsletter SEO helps businesses optimize their email content for search and engagement.

This service can improve visibility and drive traffic back to a website.

Adding Keyword-Rich Content:

• A custom GPT can be trained to understand your brand's voice and target keywords.
• When you provide a topic, it can suggest relevant keywords to naturally integrate into the newsletter copy.
• This helps ensure that the content is not only engaging but also optimized for potential search engine indexing, depending on the platform's settings.

AI Suggestions for Subject Lines & Snippets:

• The GPT can analyze your content and generate multiple, A/B test-ready subject lines and email snippets.
• These suggestions are designed to improve open rates by being concise, intriguing, and keyword-focused.
• The AI can also tailor the tone to be more urgent, friendly, or professional based on your specific campaign goals.

U.S. SEO & Email Compliance Considerations:

• While optimizing for SEO, it's crucial to follow U.S. compliance laws like the CAN-SPAM Act.
• The content should not be misleading, and the newsletter must include a clear, easy-to-find unsubscribe option and a valid physical address.
• A Custom GPT can be configured with instructions to always include these required elements, ensuring your campaigns are both effective and compliant.

Best Practices for Building Custom GPT Newsletters

Building a custom GPT for newsletters can save time and improve content consistency. However, you must follow best practices to ensure the output is high-quality, ethical, and respects user privacy.

Ethical AI Use:

• Be transparent with your audience about your use of AI. Consider adding a small note at the bottom of the newsletter indicating that some content was generated with AI assistance. This builds trust with your subscribers.
• Avoid misinformation. Always fact-check any information the GPT produces, as AI models can "hallucinate" or generate false statements. A human review is essential before publishing.

Quality Checks:

• Refine your prompts to get the best results. Be specific about the tone, style, length, and key points you need the GPT to include. The more detailed your instructions, the better the output will be.
• Always edit the final content. While a GPT can create a great first draft, you need to add your personal touch, correct any awkward phrasing, and ensure the content aligns with your brand's voice. This human element is what makes the newsletter unique and authentic.

Data Privacy for U.S. Customers:

• Ensure your custom GPT and the platform it runs on comply with U.S. data privacy laws like the CCPA (California Consumer Privacy Act).
• Be clear in your privacy policy about how you use subscriber data with AI. State what information is collected, how it's used to personalize content, and who has access to it.
• Use anonymized data where possible and never feed personally identifiable information into the GPT for training purposes. This helps protect customer privacy and reduces legal risk.

Best GPT-Compatible KYC & AI Agent Solutions

These providers are leading the market in 2026 by offering modular, AI-first tools that can be easily integrated into GPT-powered ecosystems:

• iDenfy: Consistently ranked as the overall best KYC software in 2025, iDenfy offers an "AI-native" stack that provides real-time identity checks, AML, and KYB solutions with a 4.9/5 satisfaction score.
• Greenlite AI: Specifically designed for the "agentic" era, Greenlite provides AI agents that perform automated screening, enhanced due diligence, and ongoing monitoring, acting as a direct extension for AI-driven compliance teams.
• Spektr: A modular compliance platform that utilizes "no-code" workflows and AI agents to orchestrate complex KYC/KYB journeys, making it highly compatible with GPT-based automation layers.
• Veriff: Known for its "AI-powered" precision, Veriff's robust API and SDKs allow GPT-driven systems to trigger rapid identity checks (as fast as 6 seconds) and receive structured, machine-readable verification data.
• Lyzr Agent Studio: While not a standalone KYC provider, Lyzr offers a blueprint for building "Full-Stack KYC Agents." It allows enterprises to integrate trusted KYC APIs (like Onfido or Trulioo) into a GPT-orchestrated workflow for centralized compliance management.

Key Platforms for Building AI-Integrated KYC

If you are building a custom GPT-based compliance tool, these infrastructure providers are the standard for 2025:

• LSEG Risk Intelligence (World-Check): Provides the massive, structured datasets (sanctions, PEPs, adverse media) that GPT models require for accurate risk assessment.
• Quantexa: Uses its Decision Intelligence Platform to join internal and external data, creating a "connected data foundation" that GPT-powered analysis tools can query for deeper relationship mapping.
• Sumsub: Offers an all-in-one platform with extensive document coverage and biometric tools that can be automated through a single API.

Custom GPT for Content Creation

Custom GPTs for content creation allow you to build specialized AI agents tailored to your specific brand voice, niche, and workflow. By using custom instructions and uploaded knowledge files, these agents can generate content that is significantly more consistent and accurate than generic AI responses.

Popular Use Cases for Creators

• Social Media Savant: Specialized in crafting platform-specific captions (e.g., LinkedIn vs. TikTok) with specific character counts and emoji preferences.
• SEO/Local Service Pages: Generates keyword-optimized landing pages or blog posts by referencing specific target locations and business info provided in the knowledge base.
• UX/Content Design Assistant: Builds structured error messages or UI copy based on a predefined company style guide.
• Topic-Specific Experts: Agents trained on niche databases, such as medical research, legal documents, or entrepreneurship knowledge bases.

Key Benefits of Custom GPT for Content Creation

• Brand Consistency: You can train the GPT to mimic your unique tone, vocabulary, and formatting rules.
• Workflow Automation: Integrate with tools like Zapier to automate the distribution of generated content across social platforms.
• Efficiency at Scale: Reduces time spent on repetitive tasks like meta-description generation or content drafting.

How to Create a Custom GPT in ChatGPT

1. Access the GPT Builder: Log in to OpenAI and select Explore GPTs -> Create.
2. Configure Instructions: Use the Configure tab to provide detailed "System Instructions." Clearly define the GPT’s role, goal, and communication style.
3. Upload Knowledge: Upload PDFs, text files, or spreadsheets (e.g., your brand’s style guide or past top-performing articles) that the GPT should use as a reference.
4. Add Conversation Starters: Create clickable prompts (e.g., "Write a blog intro about [Topic]") to help users start tasks quickly.
5. Test and Refine: Use the Preview pane to test responses and refine instructions based on the output quality.

How to make money with GPT's?

You can make money with custom GPTs through a few primary avenues: direct revenue share from OpenAI, offering specialized services or digital products that use your GPT as a tool or a lead magnet, and consulting. The most effective strategy involves building a solution for a specific, proven niche problem.

Monetization Strategies

• OpenAI GPT Store Earnings: OpenAI has announced a revenue-sharing program for creators whose GPTs are featured in the OpenAI GPT Store, based on user engagement. This is a direct, though competitive, method.
• Offer as a Service or Product: Instead of relying solely on the store, the most common approach is to use a custom GPT as part of a broader business offering.
  • Subscriptions: You can create a specialized AI tool for a specific niche (e.g., a legal contract review bot or an academic writing assistant) and charge a recurring subscription fee for access through third-party platforms.
  • Content Creation & Consulting: Leverage GPTs to increase efficiency in your own work, such as generating social media content, editing services, or blog posts, and offer these services to clients. You can also position yourself as an expert in building AI solutions and offer consulting services to businesses.
  • Digital Products/Affiliate Marketing: Use your GPT as a lead generator, directing users to purchase related digital products like e-books, templates, or courses. You can also embed affiliate links within your GPT's responses to earn commissions on sales.
  • Lead Generation: A custom GPT can gather user information (with their explicit consent and a clear privacy policy) and funnel potential clients to your one-on-one consultation calls or other in-depth services.

Best Practices for Making Money with GPT's

• Focus on a Niche: Don't build a general-purpose bot. Target a specific problem for a specific audience (e.g., a "resume writer for Amazon KDP authors" instead of a "writer for everyone").
• Solve a Real Problem: The most successful GPTs solve problems that people are already willing to pay for a human to solve, but the bot delivers the solution faster or more efficiently.
• Market Outside the Store: Relying solely on discovery within the GPT Store is difficult due to saturation. Promote your GPT and associated services on social media platforms like LinkedIn or X, or in relevant online communities and forums.
• Provide Value Velocity: Ensure the GPT provides a useful result quickly. The faster a user gets something useful, the more likely they are to use it again or upgrade.

How to use Chatgpt for Email Writing?

To use ChatGPT for email writing in 2025, you can either interact with the web interface directly or use integrated extensions that bring AI into your inbox. The key to high-quality results is providing context, tone, and specific goals.

Method 1: Using the Web Interface

Copy and paste a prompt into the ChatGPT website or mobile app. Use these proven prompt structures for different needs:

• Drafting New Emails: Define the recipient, purpose, and key points.
  • Prompt Example: "Write a professional email to a Marketing Manager at a tech startup. Goal: Schedule a 15-minute demo of our ROI-tracking software. Highlight that it saves 5 hours of manual work weekly."
• Replying to Threads: Paste the original email and tell ChatGPT how you want to respond.
  • Prompt Example: "Reply to this email [Paste Email]. Tell them I can't do the meeting on Monday, but Tuesday at 2 PM works. Keep it friendly yet professional."
• Improving Existing Drafts: Ask ChatGPT to refine your own writing.
  • Prompt Example: "Rewrite this draft to be more concise and use a persuasive tone. Ensure it includes a clear call to action."

Method 2: Integrating Directly into Your Inbox

You can use browser extensions and workspace add-ons to write emails without leaving your email client:

• Gmail: Use extensions like ChatGPT for Gmail or GPT Workspace. These add a "Generate Reply" or AI icon directly in your compose window.
• Outlook: Use the ChatGPT Writer extension or Outlook-specific add-ins to highlight text and generate responses based on that selection.
• Custom GPTs: Use specialized GPTs like AI Email Writer or Write For Me which are pre-configured with expert email-writing instructions.

Best Practices for Better Results

• Use Role-Playing: Start your prompt with "Act as an expert [Job Title]" to align the vocabulary with your industry.
• Provide Style Examples: Paste 2–3 of your own past emails and ask ChatGPT to "write in this style" to avoid sounding like a generic bot.
• Prioritize Privacy: Remove sensitive personal data like full names, phone numbers, or private financial details before pasting content into ChatGPT.
• Formatting Matters: Ask for specific formatting like bullet points for clarity or a specific character count for subject lines.

What are the Top Email Marketing Platforms with Custom AI Agents?

In 2026, several top email marketing platforms have moved beyond basic automation to offer custom AI agents that can autonomously write content, manage segments, and optimize entire customer journeys.

The top platforms featuring these advanced agentic capabilities include:

• Mailmodo: A leader in "interactive" emails, Mailmodo features AI Agents that handle end-to-end tasks like planning campaign strategies, writing contextual copy, and building entire journeys based on simple chat prompts.
• ActiveCampaign: Known for its AI-powered automation builder, it can create complex multi-step customer journeys from a single natural language prompt. It also uses "Predictive Content" to match five different versions of an email to the specific tone and style preferred by each recipient.
• HubSpot: The platform's Breeze Intelligence includes a "Breeze Copilot" agent that works as an AI teammate. It uses your CRM data to draft responses, generate strategic analysis, and build complex workflows from plain language descriptions.
• Instantly.ai: Specifically for cold outreach, its Instantly Copilot agent autonomously identifies leads, tests which copy resonates, and fine-tunes your technical email infrastructure to maximize ROI.
• Brevo (formerly Sendinblue): Features an AI assistant named Aura that manages content generation, audience segmentation, and "Send-Time Prediction" to schedule individual deliveries when a contact is most likely to engage.
• Klaviyo: Focused on eCommerce, its AI agents use predictive analytics to forecast customer churn risk and lifetime value, and its "Smart Product Recommendation Engine" dynamically inserts items based on past behavior to boost clicks by up to 30%.
• Omnisend: Utilizes AI Agents to automate multi-channel marketing across email, SMS, and push notifications. These agents handle real-time campaign monitoring, smart content creation, and churn prediction.

What's Next

The ability to create custom GPT to help write newsletters is a game-changer for U.S. businesses, marketers, and institutions. By combining AI with email marketing tools, companies can deliver consistent, personalized content that saves time while improving engagement. Whether it’s generating HTML/CSS layouts, integrating with Pabbly for automation, or optimizing newsletters for SEO, custom GPTs empower organizations to streamline processes without losing their human touch.

For institutions, GPT goes beyond newsletters, powering digital handbooks, onboarding materials, and policy documents. For marketers, it ensures every campaign is both scalable and aligned with brand voice.

As AI adoption grows across U.S. businesses, embracing custom GPT solutions isn’t just a competitive advantage, it’s fast becoming a necessity. The future of newsletters is intelligent, automated, and deeply connected to your audience’s needs.

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