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postfix fails to save copy in sent folders on emails with large attachments

ua flag

I use postfix and courier on my email server on debian 11. Whenever I send an email with attachments larger than a few MB (I use a slow cellohone-connection), it fails on saving the copy in the Sent folder.

The email is successfully sent, only the copy fails. Smaller emails are copied into the Sent folder fine (I use only IMAP-ssl, in Thunderbird, on Ubuntu 22.04)

I have set

message_size_limit = 90000000 

in postfix/main.cf. Is there another limit on email-size of the sent emails somehow?

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fr flag
anx
Please [quote the error you get in place of "the copy fails"](https://serverfault.com/posts/1102226/edit).
anx avatar
fr flag
anx
Please clarify the method by which messages usually end up in the sent folder. If you store them via IMAP, up to 4GiB per message should be fine in common software (64-bit size support is not yet common). Without more *configuration & logs* we may not be able to guess whether you are looking at mail server configuration, a mail client bug, webmail client setup mistake, connection interference, or mailbox (not message) size limits ("quota"), .. - even just showing the message headers (such as `Received:`) might explain what software imposing size limits could be involved.
anx avatar
fr flag
anx
What is logged in the thunderbird error console (ctrl+shift+J)? You may be able to get a clearer picture if you try saving a Draft, instead of actually sending, since you are only interested in the IMAP upload part, not the SMTP send part that you assume is working.
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