We are sending couple of emails to our customer from Cases and for the past few weeks we are getting back lot of undeliverable email even though the email address is valid. I'm troubleshooting the issue and help me to clarify my doubts
From some emails I can see send address is postmaster@ and for others it is [email protected]. Is this signifies anything ?
If the sender is [email protected] then is it due to SFDC mailer daemon ?
"5.4.7 [internal] exceeded max time without delivery" error message signifies any particular issue ?