Sender address rejected: not logged in

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  LDAP
- Linux/BSD distribution name and version: Ubuntu 12.04.3
- Related log if you're reporting an issue:
Feb  2 13:51:28 mail postfix/smtpd[14674]: NOQUEUE: reject: RCPT from x[xx.xx.xx.xx]: 553 5.7.1 <x@x.com>: Sender address rejected: not logged in; from=<x@x.com> to=<x@x.com> proto=ESMTP helo=<x>

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Hi Zhang, i have an application server that is using our local provider SMTP. I was suspicious when I stopped receiving emails from the app server.

I checked the logs of iredmail and found out that my iredmail is blocking my providers SMTP. Maybe thats mainly the reason why I stopped receiving emails from it.

Thanks for the help!