I am using zimbra open source edition. It is working very fine. But I am facing one problem, while configuring Nokia N81 mobile or MS outlook then i can receive mails but can not send the mail.pls describe what should i need to change so that i can get rid off the problem.
It returns this message when try to send email
Your message did not reach some or all of the intended recipients.
Sent: 1/7/2010 4:10 PM
The following recipient(s) could not be reached:
'firstname.lastname@example.org' on 1/7/2010 4:10 PM
554 5.7.1 <email@example.com>: Relay access denied
Thanks in advance