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I already edited the main.cf file like this:

message_size_limit = 25600000
service postfix restart

postconf message_size_limit
message_size_limit = 25600000

I tried to send a mail with 18GB of total attachments and the log still showed:

NOQUEUE: reject: MAIL
552 5.3.4 Message size exceeds fixed limit; proto=ESMTP

Does something else can cause this?

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3

I needed an even bigger limit.

When sending an attachment, it's first converted to text (MIME), which causes it to be a bit larger... 25% - 33% larger, if I remember correctly.

https://www.virtualmin.com/node/35034#comment-139301

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