Hello, The "Received" header in an email message provides a chronological record of the message's journey as it travels from the sender to the recipient. Each "Received" header represents a step in the email's delivery process, showing the mail serve...

The error message "Remote Server returned '554 4.4.2 < #4.4.2 X-Postfix; conversation with {cisco spam gateway} timed out while receiving the initial server greeting>" indicates that the remote server (in this case, the Cisco Spam Gateway) did not re...

The error message "5.4.7 - Delivery expired (message too old) '[Errno 0] Error'" indicates an issue with email delivery. This error typically occurs when the email message takes too long to be delivered and eventually times out. Here are some steps t...