MailgentGetting Started
Reply to Email
Reply to an incoming email in a thread
When your agent receives an email, it can reply — keeping the conversation in the same thread.
Via MCP
Agent calls mail.reply:
messageId: "<abc123@gmail.com>"
text: "Thanks for reaching out! Here's the info..."Via API
curl -X POST https://api.mailgent.dev/v0/messages/%3Cabc123%40gmail.com%3E/reply \
-H "Authorization: Bearer mgent-your-api-key" \
-H "Content-Type: application/json" \
-d '{"text": "Thanks for reaching out! Here'\''s the info..."}'What Happens
- Subject is prefixed with
Re:automatically In-Reply-ToandReferencesheaders are set (proper threading)- Reply goes to the original sender
- Message is added to the same thread
Response
{
"messageId": "<new-uuid@mailgent.dev>",
"threadId": "thd_f8e2a1c4d7b90e3f",
"subject": "Re: Question about pricing",
"labels": ["sent"]
}The threadId matches the original message — the conversation stays threaded.