How to Use AI for Email in 2026: Write, Summarise and Reply Faster
Most people do not struggle to send an email.
They struggle with everything that happens before they press Send.
You open a thread with 18 replies and cannot remember what was finally decided.
A customer sends a long complaint and you need to respond calmly.
Your manager wants a project update, but your notes are scattered across messages.
You know exactly what you want to say, but somehow spend 15 minutes rewriting three paragraphs.
This is one of the areas where AI has moved from “interesting technology” to something genuinely useful.
Today, tools such as Gemini in Gmail, Microsoft Copilot in Outlook and ChatGPT can help you summarise email conversations, extract action items, draft replies, rewrite messages and adjust tone.
Google says Gemini in Gmail can summarise threads, find emails, create action-item lists, suggest replies and help draft new messages. Microsoft similarly offers Copilot features in Outlook for summarisation, drafting and email coaching.
But the useful question is not:
“Can AI write emails?”
It is:
“Which AI should I use, and what should I actually ask it to do?
”That is what this guide will show you.
The Three AI Email Setups We’ll Use
For most readers, there are three practical ways to use AI with email.
Your email setup Best starting option Why
Gmail / Google Workspace Gemini in Gmail AI works inside your inbox
Outlook / Microsoft 365 Copilot in Outlook Summarising, drafting and coaching are built into Outlook
Any email provider ChatGPT Best when you want flexible rewriting, summarising and prompt control
You do not need all three.
If you already live in Gmail, start with Gemini.
If your company uses Outlook, Copilot is usually more convenient.
If your email application does not have built-in AI or you want greater control over the writing ChatGPT works well as a separate writing assistant.
1. Gemini in Gmail: Use AI Without Leaving Your Inbox
The biggest advantage of Gemini in Gmail is simple:
You do not have to copy the conversation somewhere else.
Gemini appears inside Gmail through the Ask Gemini panel.
Google documents Gmail capabilities including thread summaries, inbox searches, action-item extraction, reply suggestions, drafting and proofreading.
How to Summarise a Long Gmail Thread
Imagine returning from leave to a conversation containing 25 replies.
Normally, you would scroll upward and reconstruct what happened.
Instead:
Open the email thread in Gmail.
Click Ask Gemini in the upper-right area.
Then ask:
Summarise this email thread.
Tell me:
What the discussion is about
What has already been decided
What is still unresolved
Actions assigned to me
Any deadlines mentioned
Google itself suggests prompts such as “Summarize this email,” “Create a list of action items for me based on this email,” and requests to catch up on project messages.The result is far more useful than a generic paragraph summary.You want AI to turn the conversation into decisions and actions.
Better follow-up prompt
Once Gemini has summarised the thread,
ask:
Based on this conversation, what exactly should I reply now? Draft a short response confirming only the final decisions and my next action.Now you have gone from:
25 emails → summary → action → reply
That is the kind of workflow
2. Use Gemini to Find Information Buried in Your Inbox
AI email search can also be useful when you remember the information but not the message.Instead of trying combinations such as:
“invoice vendor June final revised
”you can ask Gemini in more natural language.
Google gives examples such as:
Show my unread emails.or:
Find emails from [person] sent last week.
Gemini can load matching Gmail results and help you work with them. A more useful business example would be:
Find the latest emails about the Zenith campaign and tell me the most recent agreed launch date.
Or:
Find emails from Anil about the revised quotation and summarise what changed.
This can save significant time when a project has been running for weeks and information is scattered across several conversations.
Practical tip
After Gemini finds the answer, open the underlying email yourself before acting on important information such as pricing, dates or approvals.
AI is excellent at helping you locate information.
The source email should still be your final reference.
3. Draft an Email in Gmail With AI
Suppose you need to tell a client:The campaign is ready.Creative approval is still pending.If approval does not arrive by tomorrow afternoon, Monday’s launch may slip.Your raw notes might look like this:
campaign ready. creative pending. if they don't approve by tomorrow 2pm monday launch at risk. ask them politely.
That is enough information for AI.
Use:
Draft a professional email using these notes.
Keep it friendly but clear.
Mention the risk without sounding threatening.
Make the requested action obvious.
Maximum 100 words.
Notes: [paste notes]This is where AI is strongest.
You already provide the facts.AI provides the structure.
4. Microsoft Copilot in Outlook: AI Built Into Corporate Email
If your organisation uses Microsoft 365, Copilot can work directly inside Outlook.Microsoft currently documents three particularly useful email functions:
Summarize, Draft with Copilot, and Coaching by Copilot.
5. Summarise an Outlook Conversation With Copilot
Open the email conversation.At the top of the thread, choose Summary by Copilot or Summarize, depending on your Outlook version.Copilot scans the conversation and generates the main points. Microsoft says supported summaries may also contain numbered references that take you back to the relevant messages. In new Outlook, Microsoft also supports summarising certain attachments—including PDF, Word and PowerPoint files—from the email. This creates a useful workflow when somebody emails you a 20-page proposal.
Instead of:
Open attachment → read 20 pages → return to email → write response
you can first understand the core information.
You should still read important source material before making a major decision, but AI can tell you where to focus.
6. Draft With Copilot Instead of Starting From a Blank Email
Microsoft's Draft with Copilot can generate a full email from instructions, and users can refine the tone and length afterward. Imagine you need to follow up with a vendor who has already missed two deadlines.A poor prompt would be:Write an email to vendor.A much better one:Write a firm but professional follow-up to a vendor whose delivery is already five days late.
Ask for:
-confirmed dispatch date,
-revised delivery date,
-reason for the delay.
-Keep the email under 130 words.
-Do not sound aggressive, but make the urgency clear.
Now AI understands the:
Audience + situation + objective + tone + length
That same formula works in almost every AI writing tool.
7. Let Copilot Critique an Email You Already Wrote
Sometimes you do not want AI to write the message.
You want to write it yourself and use AI as an editor.
This is where Coaching by Copilot becomes interesting.
Microsoft says Coaching can review a draft and suggest improvements related to tone, clarity and reader sentiment.
For example, you write:
We had already asked the team multiple times for this data and unfortunately we still have not received anything, which is now creating major delays.
Copilot may help identify that the message could sound accusatory.
You can then decide whether to soften it.
The important part is that you remain the writer.
AI acts as a second opinion.
8. Make Copilot Write More Like You
One common complaint about AI email is:
“It doesn't sound like me.”
Microsoft now lets supported Outlook users set custom drafting instructions for Copilot.
You can tell it something like:
Keep emails short and direct.
Use bullet points when useful.
Avoid overly formal openings.
Use a friendly but confident tone.
Never use phrases such as “I hope this email finds you well.
”Copilot can then use those preferences when generating future drafts. This is a much better approach than manually telling AI:Make it less robotic.every single time.
9. ChatGPT for Email: The Flexible Option
Built-in Gmail and Outlook AI features are convenient.
ChatGPT becomes useful when you want more control.
OpenAI describes ChatGPT as capable of drafting, rewriting and summarising content, and its writing guidance specifically recommends giving the model your audience, purpose, raw material and constraints.
OpenAI
Official application
Open ChatGPT
Writing guide
OpenAI's Writing With ChatGPT Guide
10. Turn Rough Thoughts Into a Professional Email
This is probably the most practical ChatGPT email use.
Do not waste time trying to write a perfect prompt.
Give it the messy version.
Example:
Need to tell Rajesh pricing approved but inventory issue means campaign can't start tomorrow. likely Wednesday. Need final confirmation from ops tomorrow morning.
Then:
Turn these notes into a concise professional email.
Audience: client.
Tone: confident and transparent.
Do not exaggerate or add facts.
Keep it under 120 words.
Make the next step clear.
ChatGPT can handle the language. You handle the truth.
11. Make AI Rewrite Without Making You Sound Like a Robot
Try this:
Rewrite this email while preserving my natural tone.
Keep sentences short.
Remove unnecessary corporate language.
Do not use exaggerated politeness.
Do not change any facts.
Make the main request obvious within the first three sentences.
This is particularly good for emails where your first draft is accurate but unnecessarily long.
OpenAI's own writing guidance recommends giving specific revision instructions such as shortening text by a percentage or clarifying the call to action rather than simply saying “make it better.”
12. Use AI to Write Different Versions for Different People
The same information may need different communication depending on the reader.
Suppose sales are down 12%.For your manager, you may need:
Rewrite this as a 100-word leadership update focused on business impact and corrective action.
For your internal team:
Rewrite this as a collaborative message explaining what happened and the three things we need to do next.
For a client:
Rewrite this without internal details.
Focus on what we are doing to improve performance.
Same facts.
Different audience.
This is one of AI's most useful workplace writing abilities.
13. Summarise a Long Thread With ChatGPT
If you cannot use Gemini or Copilot in your work account, paste the non-confidential conversation into ChatGPT.
Use:
Summarise this email conversation.
-Separate the answer into:
-Context
-Decisions
-Disagreements
-Pending questions
-Actions
-Owners
-Deadlines
Do not infer anything that was not explicitly stated.
That final sentence matters.
Without it, AI may occasionally fill gaps because it is trying to produce a complete answer.
You want missing information to remain missing.
14. Turn an Email Into Tasks
Suppose you receive:
Please revise slides 4 and 6, check the numbers with Finance, get Rahul's approval and send the final deck before Thursday evening.
Instead of leaving this buried in your inbox:
Convert this email into an action checklist.
For each task show:
Action | Owner | Deadline | Dependency.
Write “not specified” wherever the email does not provide the information.
Now the email becomes execution.
This is a recurring principle across practical AI use:
Do not only ask AI to summarise information. Ask it to transform information into the next useful format.
15. Five Email Prompts Worth Saving
The Shorten Prompt Cut this email by approximately 40% without removing any facts, deadlines or actions.
The Senior Leadership Prompt
Rewrite this for a senior executive.
Start with the conclusion, then business impact, risk and next action. Maximum 120 words.
The Difficult Client Prompt
Rewrite this so it acknowledges the client's frustration without accepting responsibility for anything that has not been confirmed.
The Clarity PromptReview this email and identify anything the recipient could misunderstand.
Then rewrite only those sections.
The Natural Tone Prompt
Make this sound like a competent human wrote it quickly not a corporate template or AI assistant.
Gemini vs Copilot vs ChatGPT: Which Should You Use?
If you use Gmail every day, Gemini has the biggest convenience advantage because it can work directly with supported inbox content.
If your company operates heavily inside Microsoft 365, Copilot in Outlook is particularly useful because summarisation, drafting and coaching happen inside the email application itself.
If you want the most flexibility for rewriting, changing formats, experimenting with prompts or processing text outside a specific mail ecosystem, ChatGPT is a strong general-purpose option.
There is no reason to use all three.
Choose the one closest to where your work already happens.
What AI Should Not Do With Your Email
AI should not decide what your company is promising.
It should not invent delivery dates.
It should not decide whether a customer qualifies for compensation.
It should not fabricate an approval because the conversation seems to imply one.
And you should not casually paste sensitive company information into external tools when your employer has not approved that use.
Google itself cautions users that Gemini-generated content can be inaccurate, and OpenAI similarly recommends verifying facts in AI-assisted writing.
OpenAI
A useful division of labour is:
Human: facts, judgement, commitments and decisions.
AI: summarising, organising, drafting and rewriting.
The Best AI Email Workflow
A practical workflow looks like this:
Incoming email → AI summary → identify required action → AI first draft → human fact-check → send
For your own outgoing communication:
Rough thoughts → AI structure → tone refinement → human review → send
The AI is not replacing email communication.
It is removing the friction around it.
How Much Time Can This Actually Save?
The biggest savings are usually not from one dramatic automation.They come from repeating small improvements.
-Five minutes saved summarising a thread.
-Seven minutes saved writing a difficult response.
-Ten minutes saved searching for an old decision.
-Five minutes saved rewriting an update.
Do that across hundreds of emails in a year and AI becomes far more meaningful than simply being another chatbot you occasionally open.
Final Thoughts
Email is a perfect example of what practical AI should look like.
You are not asking AI to do something futuristic.
You are asking it to remove friction from a task you already perform every day.
Gemini can help you understand Gmail faster.
Copilot can help you work inside Outlook.
ChatGPT can help turn rough thinking into clear communication.
The important skill is not learning 50 prompts.
It is noticing:
“I am spending too much time reading, rewriting or reorganising this information.
Can AI handle the first part?
”That is where AI begins to improve real work.
And that is exactly the kind of AI use Docodealz should help readers discover.
Explore:
ChatGPT –Claude – Gemini
Frequently Asked Questions
Can AI write emails for me?
Yes. ChatGPT, Gemini in Gmail and Microsoft Copilot can all assist with email drafting or rewriting. The user should still verify factual information and commitments before sending.
Can Gemini summarise Gmail conversations?
Yes. Google documents email-thread summarisation and action-item extraction among Gemini's Gmail capabilities.
Can Copilot summarise Outlook emails?
Yes. Outlook supports Summary by Copilot, which scans a conversation for key points; supported versions can also surface references back to specific messages. Microsoft SupportCan Copilot improve an email I already wrote?Yes. Microsoft offers Coaching by Copilot, which can provide suggestions related to tone, clarity and reader sentiment.
Can I use ChatGPT if my company does not have Gemini or Copilot?
Yes, provided your organisation permits it.
You can use ChatGPT with non-sensitive text to draft, rewrite or summarise email content.
OpenAI recommends treating generated writing as a draft that you review.
Should I paste confidential company emails into AI tools?
Not automatically. Follow your organisation's information-security and AI policies. For unapproved external services, remove confidential details or use synthetic examples instead.
Still deciding which email AI tool is right for you? See our comparison of the best AI email assistants.
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