552 5.3.4 Message size exceeds fixed limit

Question

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?

[SMTP wasn't designed/recommended to send a big file](http://serverfault.com/a/304425/218590) — masegaloeh, Mar 27 '15 at 06:22

score 5 · Accepted Answer · answered Mar 27 '15 at 05:01

5

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.

answered Mar 27 '15 at 05:01

givanse

score 0 · Answer 2 · answered May 15 '23 at 18:37

0

message_size_limit is measured in bytes.

message_size_limit = 25600000

for 18GB, you need 3 additional zeroes to the number.

answered May 15 '23 at 18:37

Zoltán Kolonits

no matter, this would kill any server/client implementation - smtp was and is not made for sharing such waste – djdomi May 28 '23 at 14:41

2 Answers2