[GH-ISSUE #648] Support 8BITMIME #403

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opened 2026-03-15 14:16:18 +03:00 by kerem · 6 comments
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Originally created by @schutm on GitHub (Feb 23, 2026).
Original GitHub issue: https://github.com/axllent/mailpit/issues/648

According to https://www.rfc-editor.org/rfc/rfc6531#section-3.1 mailpit should support (announce the support of) 8BITMIME, because it announces SMTPUTF8. Is support for 8bit mime being considered (maybe it only needs to be announced?)

Originally created by @schutm on GitHub (Feb 23, 2026). Original GitHub issue: https://github.com/axllent/mailpit/issues/648 According to https://www.rfc-editor.org/rfc/rfc6531#section-3.1 mailpit should support (announce the support of) 8BITMIME, because it announces SMTPUTF8. Is support for 8bit mime being considered (maybe it only needs to be announced?)
kerem closed this issue 2026-03-15 14:16:23 +03:00
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@axllent commented on GitHub (Feb 23, 2026):

maybe it only needs to be announced?

Thanks @schutm. I strongly suspect you are correct here, however I am interested in what drew you to this conclusion?

<!-- gh-comment-id:3947116546 --> @axllent commented on GitHub (Feb 23, 2026): > maybe it only needs to be announced? Thanks @schutm. I **strongly** suspect you are correct here, however I am interested in what drew you to this conclusion?
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@schutm commented on GitHub (Feb 23, 2026):

I'm implementing a mua and just reading the specs (which are a real mess) drew me to this conclusion. In addition checking the code/responses of several MTA's (postfix, exim, outlook.com and gmail), sendmail might differ.

<!-- gh-comment-id:3947558449 --> @schutm commented on GitHub (Feb 23, 2026): I'm implementing a mua and just reading the specs (which are a real mess) drew me to this conclusion. In addition checking the code/responses of several MTA's (postfix, exim, outlook.com and gmail), sendmail might differ.
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@axllent commented on GitHub (Feb 23, 2026):

I admittedly do not understand much about 8BITMIME, however Clause (AI) agreed with your conclusion and suggested I simply add it in the list of existing EHLO responses. Are you using the Docker version of Mailpit in your environment? If so, then I have fixed this already in the axllent/mailpit:edge Docker image (if you could please test and confirm).

<!-- gh-comment-id:3947667207 --> @axllent commented on GitHub (Feb 23, 2026): I admittedly do not understand much about 8BITMIME, however Clause (AI) agreed with your conclusion and suggested I simply add it in the list of existing EHLO responses. Are you using the Docker version of Mailpit in your environment? If so, then I have fixed this already in the `axllent/mailpit:edge` Docker image (if you could please test and confirm).
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@schutm commented on GitHub (Feb 24, 2026):

I don't understand a lot of it as well ;) I'm using the binaries. But try to test it nevertheless in a few days.

<!-- gh-comment-id:3950115673 --> @schutm commented on GitHub (Feb 24, 2026): I don't understand a lot of it as well ;) I'm using the binaries. But try to test it nevertheless in a few days.
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@axllent commented on GitHub (Feb 25, 2026):

This has been released now in v1.29.2 - so you should be able to confirm with one of the prebuilt binaries. Thanks.

<!-- gh-comment-id:3955450570 --> @axllent commented on GitHub (Feb 25, 2026): This has been released now in [v1.29.2](https://github.com/axllent/mailpit/releases/tag/v1.29.2) - so you should be able to confirm with one of the prebuilt binaries. Thanks.
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@schutm commented on GitHub (Feb 27, 2026):

I just checked, and can confirm it's there. Unfortunately I can't test the full functionality right now (and I'm not even sure I'm implementing it the right way ;))

<!-- gh-comment-id:3975003222 --> @schutm commented on GitHub (Feb 27, 2026): I just checked, and can confirm it's there. Unfortunately I can't test the full functionality right now (and I'm not even sure I'm implementing it the right way ;))
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