In this tidbit I want to cover different identifiers you will see when tailing the mail_logs in the event of troubleshooting. The ESA mail_logs are arguably the most important in terms of troubleshooting handling & processing. The mail_logs record information regarding operations of the email system. These operations can include message delivery/receiving, delivery attempts, open/closed connections, & TLS related events.
Viewing mail_logs from ESA CLI: > tail mail_logs
Viewing mail_logs from ESA GUI: System Administration->Log Subscriptions
Take the URL from the
ICID = Incoming Connection ID
MID = Message ID
RID = Recipient ID
DCID = Delivery Connection ID
A couple of things to note for each respective identifier:
ICID : a single connection can inject hundreds of messages to dozens of domains
MID : every message has a unique message ID that is internal to the ESA
RID : unique per message
DCID : a single delivery connection ID can be used to deliver multiple unrelated messages to same location
That wraps up this tidbit. Peep more via the <esa> tag. Cheers!