Hi,
I have a problem on my zimbra.

I set the max message size at 50MB, rebooted the server, but on outgoing mails I still have a 10MB limit.

It seems it's the relay to block the mail, but the relay is a postfix server with a 50MB limit, and accepts greater than 10MB mails from everywhere. No doubt about it.

This is the Zimbra log:
Jan 12 19:31:45 webmail postfix/qmgr[2439]: 7A26A9A196F: from=<sender@domain1.it>, size=15448245, nrcpt=10 (queue active)
Jan 12 19:31:45 webmail postfix/smtp[27853]: 7A26A9A196F: to=<recipient@domain2.it> relay=mail.domain2.it[relay_public_ip]:25, delay=3.8, delays=3.7/0.02/0.07/0, dsn=5.3.4, status=bounced (message size 15448245 exceeds size limit 10000000 of server mail.domain2.it[relay_public_ip])


If you need, this is the debug log of the relay server:
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: connect from unknown[sender_public_ip]
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: send attr request = connect
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: send attr ident = smtp:sender_public_ip
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: private/anvil: wanted attribute: status
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute name: status
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute value: 0
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: private/anvil: wanted attribute: count
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute name: count
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute value: 1
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: private/anvil: wanted attribute: rate
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute name: rate
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute value: 1
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: private/anvil: wanted attribute: (list terminator)
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute name: (end)
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 220 mail2.domain.it ESMTP Postfix
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: watchdog_pat: 0xb88152e8
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: < unknown[sender_public_ip]: EHLO webmail
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250-mail2.domain.it
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250-PIPELINING
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250-SIZE 51200000
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250-VRFY
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_list_match: unknown: no match
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_list_match: sender_public_ip: no match
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250-ETRN
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250-ENHANCEDSTATUSCODES
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250-8BITMIME
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: > unknown[sender_public_ip]: 250 DSN
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: watchdog_pat: 0xb88152e8
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: smtp_get: EOF
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_hostname: unknown ~? public_subnet_of_relay/24
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_hostaddr: sender_public_ip ~? public_subnet_of_relay/24
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_hostname: unknown ~? 192.168.0.0/24
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_hostaddr: sender_public_ip ~? 192.168.0.0/24
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_list_match: unknown: no match
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: match_list_match: sender_public_ip: no match
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: send attr request = disconnect
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: send attr ident = smtp:sender_public_ip
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: private/anvil: wanted attribute: status
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute name: status
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute value: 0
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: private/anvil: wanted attribute: (list terminator)
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: input attribute name: (end)
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: lost connection after EHLO from unknown[sender_public_ip]
Jan 12 19:31:44 mx01 postfix/smtpd[14051]: disconnect from unknown[sender_public_ip]


Where I put the 50MB limit on the Zimbra:





Any hint?
Did I forget something on configuration to enhance the limit from 10MB to 50MB? Or is there some bug? Maybe something on the relay? But as I said it happens only from this IP...

Thanksss