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 ?