SMTP mail error 452 4.3.1 Insufficient system storage

I have a server which uses Postfix as the mail system. The issue I am having is I am not able to send or recieve email. If I send an email I get an instant reply from the server which says:

Subject:    test
Sent:   16/05/2011 19:08

The following recipient(s) could not be reached:

'[email protected]' on 16/05/2011 19:08
452 4.3.1 Insufficient system storage

I have check the following:

Disk space, there are gigabytes of free space on all partitions. Mailbox quotas, there are no quota,s set on any mailbox.

I cleared all the mail logs and rebooted the server but I still cannot send email. does anyone have any pointers for me to look at next.

I have looked at the main.cf file and here are the results:

virtual_mailbox_domains = $virtual_mailbox_maps, hash:/var/spool/postfix/plesk/virtual_domains
virtual_alias_maps = $virtual_maps, hash:/var/spool/postfix/plesk/virtual
virtual_mailbox_maps = hash:/var/spool/postfix/plesk/vmailbox
transport_maps = hash:/var/spool/postfix/plesk/transport
smtpd_tls_cert_file = /etc/postfix/postfix_default.pem
smtpd_tls_key_file = $smtpd_tls_cert_file
smtpd_tls_security_level = may
smtpd_use_tls = yes
smtp_tls_security_level = may
smtp_use_tls = no
smtpd_sender_restrictions = check_sender_access hash:/var/spool/postfix/plesk/blacklists, permit_sasl_authenticated, check_client_access pcre:/var/spool/postfix/plesk/non_auth.re
smtp_send_xforward_command = yes
smtpd_authorized_xforward_hosts = 127.0.0.0/8
smtpd_sasl_auth_enable = yes
smtpd_recipient_restrictions = permit_mynetworks, check_client_access pcre:/var/spool/postfix/plesk/no_relay.re, permit_sasl_authenticated, reject_unauth_destination
virtual_mailbox_base = /var/qmail/mailnames
virtual_uid_maps = static:110
virtual_gid_maps = static:31
virtual_transport = plesk_virtual
plesk_virtual_destination_recipient_limit = 1
smtpd_client_restrictions = 
myhostname = mydomain.com
message_size_limit = 2048000000

Solution 1:

Set your message_size_limit to a sane value and you will be fine.

With the current value you will need about 3Gb of free space to receive mails. If you want to set it to a really big number set it to:

message_size_limit = 104857600

This allows about 100Mb size (which no one will send you anyways as the remote limit will be smaller).

Solution 2:

From a forum post i found...

Do you have either message_size_limit or queue_minfree set?

You probably don't need queue_minfree set, and you will get the error you indicated if you don't have at least 1.5X the value of message_size_limit free (it could have a large value set by mistake)

Solution 3:

Check the size of the directories APT is using as cache. If it's storing too much, clear it (with root Privilege) using

rm -r /var/cache/apt/*.*

Solution 4:

I just resolved this issue. In the main.cf file set:

mailbox_size_limit = 0
message_size_limit = 0

Zero means it will take max limit.