Am using Zimbra zcs 5.11 GA, recently my ISP changed the IP series and i reconfigured my mail server with new IP, /etc/hosts file, but while am trying to send mail from web client and also in Zimbra Desktop am getting following error
Message not sent; one or more addresses were not accepted.
Rejected addresses: firstname.lastname@example.org
But am able to send the same mail from Outlook. i didn't change any settings in any other file except the above mentioned file.
Please help me to fix
Thanks in advance