# Message size limits

**URL:** <https://forum.delta.chat/t/message-size-limits/3759>\
**Category:** Mutual Help\
**Created:** [May 4, 2025, 8:33am UTC](https://forum.delta.chat/t/message-size-limits/3759 "2025-05-04T08:33:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![DELTA\_MAFIA](https://forum.delta.chat/user_avatar/forum.delta.chat/delta_mafia/32/2624_2.png) [@DELTA\_MAFIA](https://forum.delta.chat/u/DELTA_MAFIA)\
**Post date:** [May 4, 2025, 8:33am UTC](https://forum.delta.chat/t/message-size-limits/3759/1 "2025-05-04T08:33:53Z")

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I’m using ChatMail relay on my own server and ran into an issue: I need to increase the size limit for a single email to at least 100MB. Unfortunately, I haven’t been able to make it work, despite trying many things.

I modified `main.cf` (Postfix), Dovecot configs, and changed the `max_message_size` variable in `chatmail.ini.f`. I restarted Postfix and Dovecot, but it still doesn’t work. I was able to change the mailbox quota via Dovecot, and that works fine, but increasing the message size doesn’t seem to take effect.

Could you please help me figure this out? Maybe there’s a variable related to this somewhere in the server build process using the `scripts/cmdeploy run` script?

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**Author:** ![link2xt](https://forum.delta.chat/user_avatar/forum.delta.chat/link2xt/32/1971_2.png) [@link2xt](https://forum.delta.chat/u/link2xt)\
**Post date:** [May 4, 2025, 7:24pm UTC](https://forum.delta.chat/t/message-size-limits/3759/2 "2025-05-04T19:24:24Z")

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This looks like an issue [Filtermail limits the message size · Issue #558 · chatmail/relay · GitHub](https://github.com/chatmail/relay/issues/558)

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**Author:** ![r10s](https://forum.delta.chat/user_avatar/forum.delta.chat/r10s/32/1513_2.png) [@r10s](https://forum.delta.chat/u/r10s)\
**Post date:** [October 6, 2026, 3:19pm UTC](https://forum.delta.chat/t/message-size-limits/3759/3 "2026-10-06T15:19:43Z")

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