When sending attachments, SnappyMail incorrectly calculates the maximum size and returns an error.

[lvarnava]

Nextcloud 27-29
Debian 12
Browser Chrome
Posfix 3.7.11
Dovecot 2.3.19
SnappyMail 2.38.2

I send 21 MB, mail server limit is 30 MB.

The result is on the screenshot.

postfix main.cf:

message_size_limit = 31457280
mailbox_size_limit = 0
virtual_mailbox_limit = 0

Nginx: client_max_body_size 5120M;
PHP: upload_max_filesize = 5G

[the-djmaze]

31457280 is reported by SMTP SIZE, as set by your Postfix setup.

40153212 is due to the fact that attachments are converted from binary to base64.
Base64 has a 33–37% overhead.
Including all other converted code this results in a message of 40MB

[lvarnava]

Thank you.