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I have a Centos 6 setup running a web and mail server. Email server works fine, however, my clients cannot send or receive emails with attachments size greater than 10MB.

I tried setting mailbox_size_limit and message_size_limit inside /etc/postfix/main.cf with no luck:

/etc/postfix/main.cf

mailbox_size_limit = 1073741824
message_size_limit = 52428800

I searched on how to change mail size limit for amavisd-new and spamassassin, but couldn't find a working solution. How can I change the size limit for all the mails (body+attachments)? Also I can't see those rejects inside log files like /var/log/maillog. Is there any other log files I should be looking to check for mail rejects?

Also, can dovecot, IMAP and POP3 server, be related to this issue?

  • Care to look at the maillog and post the lines relevant to the rejected message with your question? – the-wabbit Feb 10 '17 at 12:03
  • @the-wabbit thanks for the comment. As I already have stated in my question, I cannot find any message lines regarding these rejections inside /var/log/maillog. Is there any other file I should look inside for those rejects? – Christos Lytras Feb 10 '17 at 13:24
  • We don't do CentOS (much) over here, so I do not happen to have access to an actual CentOS system to check for the configuration of the syslog daemon, but do you have anything meaningful in maillog? Postfix is logging to the "mail" facility, even connection attempts are logged at the "INFO" level, so a rejection is certainly to appear in the logs as well if you find connection attempt log entries. – the-wabbit Feb 10 '17 at 13:34
  • OK. I will grep some log files for the email addresses and I will update my question with everything I found. – Christos Lytras Feb 10 '17 at 13:37

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