Kunal868: > How do we sort this issue out, so that the "secure-web.cisco.com" does not > appear in emails.
This is not a Postfix builtin feature, so it is added by a client-side or server-side antivirus system, by a Postfix content filter, or by some non-Postfix system that the mail passes through. To get help with the Postfix side, send "postconf -n" output and redacted logs as described in the mailing list welcome message, and at http://www.postfix.org/DEBUG_README.html#mail Wietse
