On Thu, 16 Apr 2020 at 15:40, natan maciej milaszewski <na...@mandzur.pl> wrote: > > Hi > Sorry about probably dumbest questions. What does it really mean? > > 552 5.3.4 Message size exceeds fixed limit > > Apr 16 16:03:48 thebe4 postfix/smtpd[11692]: NOQUEUE: reject: MAIL from > mail-il1-f169.google.com[209.85.166.169]: 552 5.3.4 Message size exceeds > fixed limit; proto=ESMTP helo=<mail-il1-f169.google.com> > Apr 16 16:03:48 thebe4 postfix/smtpd[11692]: too many errors after MAIL > from mail-il1-f169.google.com[209.85.166.169] > Apr 16 16:03:48 thebe4 postfix/smtpd[11692]: disconnect from > mail-il1-f169.google.com[209.85.166.169] ehlo=2 starttls=1 mail=0/1 > commands=3/4 > > in postfix i set > message_size_limit = 23240000 > mailbox_size_limit = 0 > > postconf -n |grep "_size_limit" > mailbox_size_limit = 0 > message_size_limit = 23240000
Pretty much what it says. An incoming mail will be refused if its size exceeds message_size_limit (in bytes). It is undocumented (and not recommended) to use message_size_limit=0 meaning 'no limit' - although mailbox_size_limit=0 is valid/documented. Although your postconf is reporting 23240000 (a little over 22MB), you can (and may) have different settings in master.cf which override this - for instance for authenticated vs non-authenticated incoming mails.
