==== Provide required information to help troubleshoot and get quick answer ====
- Linux/BSD distribution name and version: CentOS 6.2
- iRedMail version and backend (LDAP/MySQL): 0.7.4
- Any related log? Log is helpful for troubleshooting.
====

I want to use the email server to sent out some marketing email, the sender address is used another domain name.

e.g. my email server is mail.abc.com

i want to use marketing@def.com to sent out marketing email through my email server mail.abc.com with password auth

I checked the log in /var/log/maillog as below
Mar 25 03:02:03 mail postfix/smtpd[6389]: warning: unknown[213.255.139.190]: SASL CRAM-MD5 authentication failed: Invalid authentication mechanism
Mar 25 03:02:03 mail postfix/smtpd[6389]: lost connection after AUTH from unknown[213.255.139.190]
Mar 25 03:02:03 mail postfix/smtpd[6389]: disconnect from unknown[213.255.139.190]
Mar 25 03:02:03 mail postfix/smtpd[6389]: connect from unknown[213.255.139.190]
Mar 25 03:02:03 mail postfix/smtpd[6389]: disconnect from unknown[213.255.139.190]
Mar 25 03:02:03 mail postfix/smtpd[6389]: connect from unknown[213.255.139.190]
Mar 25 03:02:03 mail postfix/smtpd[6389]: 8EE84140FAF: client=unknown[213.255.139.190], sasl_method=LOGIN, sasl_username=www@abc.com
Mar 25 03:02:03 mail postfix/cleanup[6399]: 8EE84140FAF: message-id=<50203576667682495220859@BMIFM201112>
Mar 25 03:02:03 mail postfix/qmgr[6261]: 8EE84140FAF: from=<test@def.com>, size=6764, nrcpt=1 (queue active)
Mar 25 03:02:03 mail postfix/smtpd[6389]: disconnect from unknown[213.255.139.190]
Mar 25 03:02:04 mail postfix/smtpd[6389]: connect from unknown[213.255.139.190]
Mar 25 03:02:04 mail postfix/smtpd[6389]: 9166F140FB3: client=unknown[223.255.139.190], sasl_method=LOGIN, sasl_username=www@abc.com

What i need to change in the config file?
Thanks a lot.