Hi, Today morning i am hunting about how to monitor incoming and outgoing mails in Postfix & Zimbra mail server. After half an hour I got the solution and worked perfectly for me.  I am sharing some tricky steps :- Postfix V2.1 supports a “sender_bcc_maps” and  “recipient_bcc_maps”  functions. If you are using postfix then use [...]

550 “REJECTED – Bad HELO – Host impersonating If you found this error for any  particular domain say linuxsurgeon.org, then first check the mx record for this domain. If the MX record is pointing to a different server, then just remove the domain entry linuxsurgeon.org from the /etc/localdomains, And add the same entry in /etc/remotedomains. [...]