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error sending your message: Service unavailable - try again later

Graphrix

Basic Pleskian
Since the last update I am having constant troubles with email accounts when sending or replying to email messages.

This is the message I am getting:-
"error sending your message: Service unavailable - try again later"

This is our system and the software is the Parellels with Business Manager and stuff.

OS CentOS 6.5 (Final)
Plesk version 12.0.18 Update #10, last updated at Aug 4, 2014 05:00 AM

The system is up-to-date; last checked at Aug 3, 2014 04:44 AM


This is what the error looks like in the log file located at /usr/local/psa/var/log/maillog

Aug 6 11:54:08 host spamd[28992]: spamd: connection from localhost [127.0.0.1] at port 37548
Aug 6 11:54:08 host spamd[14212]: prefork: child states: II
Aug 6 11:54:08 host courier-imapd: Connection, ip=[::ffff:127.0.0.1]
Aug 6 11:54:08 host courier-imapd: LOGOUT, ip=[::ffff:127.0.0.1], rcvd=12, sent=365
Aug 6 11:54:08 host courier-imaps: Connection, ip=[::ffff:127.0.0.1]
Aug 6 11:54:08 host courier-imaps: LOGOUT, ip=[::ffff:127.0.0.1], rcvd=12, sent=356
Aug 6 11:54:08 host courier-pop3d: Connection, ip=[::ffff:127.0.0.1]
Aug 6 11:54:08 host courier-pop3d: LOGOUT, ip=[::ffff:127.0.0.1]
Aug 6 11:54:08 host courier-pop3d: Disconnected, ip=[::ffff:127.0.0.1]
Aug 6 11:54:08 host courier-pop3s: Connection, ip=[::ffff:127.0.0.1]
Aug 6 11:54:08 host courier-pop3s: LOGOUT, ip=[::ffff:127.0.0.1]
Aug 6 11:54:08 host courier-pop3s: Disconnected, ip=[::ffff:127.0.0.1]
Aug 6 11:54:47 host postfix/smtpd[3947]: connect from localhost[::1]
Aug 6 11:54:47 host postfix/smtpd[3947]: 8390C1C026E: client=localhost[::1]
Aug 6 11:54:47 host greylisting filter[3951]: Starting greylisting filter...
Aug 6 11:54:47 host /usr/lib64/plesk-9.0/psa-pc-remote[1579]: handlers_stderr: DEFER
Aug 6 11:54:47 host /usr/lib64/plesk-9.0/psa-pc-remote[1579]: DEFER during call 'grey' handler
Aug 6 11:54:47 host /usr/lib64/plesk-9.0/psa-pc-remote[1579]: Message aborted.
Aug 6 11:54:47 host postfix/smtpd[3947]: 8390C1C026E: milter-reject: DATA from localhost[::1]: 451 4.7.1 Service unavailable - try again later; from=<info@######.com.au> to=<ipswich@######.com> proto=ESMTP helo=<host.######.com>
Aug 6 11:54:47 host postfix/smtpd[3947]: disconnect from localhost[::1]
 
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