Message size limit strange problem

Spiderek

Hi,
I have a problem with e-mail sending if attachment bigger than _30MB.
It means I can send properly e-mail with attachment about 28MB size but cannot with size >40MB
(not sure precisely where is border value)

in postfix extra.cf file I have:
message_size_limit = 524288000
so as I understood there should be able to send even 500MB

I get error message: 4.7.1 Service unavailable - try again later
Same error message from SOGo web client and other mail client (e.g. Thunderbird)
Probably I need to increase another parameter. But where ?
Thx.

I-am-a-monster

I am having the same issue and couldn’t find any fix for it.

axello

You both did reboot the postfix docker container, e.g. by doing
docker compose restart postfix-mailcow ?

Also, you can enlarge the setting in mailcow, but it is highly doubtable if the receiver will accept such large attachments. e.g. this is from gmail:

Attachment size limit
The Gmail attachment size limit for incoming emails is 50 MB. That means you can accept emails from other people of up to 50 MB.
You can send up to 25 MB in attachments. If you have more than one attachment, they can’t add up to more than 25 MB.