Custom GPTs for Email Tasks

Custom GPT is a modified version of ChatGPT that you build for specific tasks, like writing emails, analyzing research, generating reports, or automating repetitive work.

They save time, improve accuracy, and help you produce more professional results with less effort. Whether you're researching environmental statistics, building marketing emails, or creating consistent brand messaging, custom GPTs give you deeper control and better outcomes than the standard AI.

Custom GPTs allow to:

• Save instructions permanently;
• Add your own files and data;
• Connect the bot to external tools;
• Create a more accurate, expert-level version of ChatGPT that fits your needs.

Custom GPT for Writing Email Subject Lines

When creating a GPT, the screen is split into two sides:

Left Side: Create & Configure Tabs

1. Create Tab: you "talk" to ChatGPT in a conversation;
2. Configure Tab: you manually enter details like:
   • Name;
   • Description;
   • Instructions;
   • Conversation starters;
   • Knowledge files;
   • Capabilities and actions.

Right Side: Preview

This shows what your GPT will look like and lets you test it as you build.

Uploading Knowledge Base Content into a Custom GPT

Knowledge base (in a GPT) is a collection of uploaded documents (like PDFs or Word files) that your custom GPT can look up and reference when answering questions or doing tasks.

Writing Email Body Copy and A/B Split Test with AI

Using ChatGPT, you can quickly generate:

• A subject line;
• A header;
• A body copy;
• A CTA.

To do a real split test (A/B test), you must change only one thing.

Split testing with ChatGPT is a powerful way to explore different tones, styles, and approaches quickly. AI helps you generate options fast, but it cannot decide what is truly good. Real customer data and human judgment must guide the final decision. The best marketers combine AI efficiency with human taste, strategy, and insight.