Oct 19 23:12:06 server2 postfix/qmgr[19009]: E07833C363: from=russell@example.com, size=98965, nrcpt=1 (queue active) Oct 19 23:12:06 server2 postfix/local[19047]: fatal: main.cf configuration error: mailbox_size_limit is smaller than message_size_limit
postconf -n:
[root@server2 log]# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = no command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 header_checks = regexp:/etc/postfix/header_checks home_mailbox = Maildir/ html_directory = no inet_interfaces = all mail_owner = postfix mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man message_size_limit = 75000000 mydestination = $myhostname, localhost.$mydomain, localhost, localhost.localdomain newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES sample_directory = /usr/share/doc/postfix-2.3.3/samples sender_bcc_maps = hash:/etc/postfix/bcc sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination reject_rbl_client zen.spamhaus.org, reject_rbl_client bl.spamcop.net smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_security_options = noanonymous smtpd_tls_cert_file = /etc/postfix/server.crt smtpd_tls_key_file = /etc/postfix/server.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/virtual [root@server2 log]#
Cause: It is my understanding that by default Postfix sets mailbox_size_limit to 50 megs:
[root@server2 log]# postconf -d | grep mailbox_size_limit mailbox_size_limit = 51200000 [root@server2 log]#
For some reason Postfix is not paying attention to what the user's quota is that is receiving the messages. The user has a 2 GB quota, but it is still failing:
[root@server2 log]# quota -us russell@example.com Disk quotas for user russell@example.com (uid 503): Filesystem blocks quota limit grace files quota limit grace /dev/xvda 7144 2048M 2048M 230 0 0 [root@server2 log]#
The only way to fix this seems to be to manually set mailbox_size_limit in main.cf to match your message_size_limit, even though a user with a quota larger than mailbox_size_limit / message_size_limit can still receive message up to their normal quota. I tested this by setting both to 5 MB, setting the user's quota to 10 MB, and I was able to send mail past the 5 MB setting for mailbox_size_limit.
EDIT: Upon further investigation of how mailbox_size_limit corresponds with a Maildir setup, it appears that it basically acts the same as message_size_limit. So perhaps mailbox_size_limit should be set to 0 on a default Virtualmin installation to prevent this problem.
Comments
Submitted by JamieCameron on Tue, 10/20/2009 - 11:19 Comment #1
I've seen this before when Postfix is setup to deliver to a mbox-format mail file instead of ~/Maildir , which is the Virtualmin default. Are you using Maildir there for inboxes, or an mbox file in /var/mail ?
Submitted by arjones85 on Tue, 10/20/2009 - 12:18 Comment #2
This is a standard Virtualmin setup with Maildir, and email usernames in user@domain.tld format.
[root@server2 homes]# pwd
/home/texas3006/homes
[root@server2 homes]# ls
new russell tmp
[root@server2 homes]#
[root@server2 homes]# cd russell
[root@server2 russell]# ls
Maildir
[root@server2 russell]#
Submitted by JamieCameron on Tue, 10/20/2009 - 12:59 Comment #3
Did you adjust mailbox_size_limit or message_size_limit manually, or were those settings that Virtualmin made when it was installed? (which is surprising, as it doesn't set mailbox_size_limit or message_size_limit).
Submitted by arjones85 on Tue, 10/20/2009 - 16:15 Comment #4
I adjusted these manually using postconf -e, as I noticed that the default message_size_limit was only 10 megs. I adjusted it to be 50, and that's when I started noticing the problem with messages no longer being delivered due to message_size_limit being larger than the default mailbox_size_limit of 10 megs.
If you would like you are more than welcome to login to my server and test. This is not really a production box yet. If you want to do that, just let me know how best to provide the login details.
Submitted by JamieCameron on Tue, 10/20/2009 - 20:15 Comment #5
So it looks like the best solution would be for Virtualmin to simply set :
message_size_limit = 0mailbox_size_limit = 0
at install time, and rely on quotas to limit disk usage..
Submitted by arjones85 on Tue, 10/20/2009 - 20:45 Comment #6
If you do not want to have a limit on how big incoming messages would be.
I would say myself the best solution would be to have mailbox_size_limit set to 0 at installation, and leave message_size_limit as the default and allow the end user to set it themselves.
Or even better, just build message_size_limit into Postfix's configuration module, and allow them to set it there.
mailbox_size_limit set to 0 makes mailbox_size_limit unlimited, regular disk quotas for the user accounts work just fine as the "mailbox" quota, and message_size_limit can be set to anything.
Submitted by JamieCameron on Wed, 10/21/2009 - 13:34 Comment #7
Sounds good to me .. I'll do this in the next installer version.
You can also change it from within Virtualmin, at Webmin -> Servers -> Postfix Mail Server -> General Resource Control.
Submitted by Issues on Wed, 11/04/2009 - 15:19 Comment #8
Automatically closed -- issue fixed for 2 weeks with no activity.