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
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From some emails I can see send address is postmaster@ and for others it is mailer-daemon@salesforce.com. Is this signifies anything ?
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If the sender is mailer-daemon@salesforce.com then is it due to SFDC mailer daemon ?
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"5.4.7 [internal] exceeded max time without delivery" error message signifies any particular issue ?
Best Answer
All issues happened only because, either the email address used is a
bad email address(it is doesn't exist or format is incorrect). Yahoo, gmail, hotmail etc. bounce these email immediately and return a mail with error code, in your case it seems5.4.7.mailer-daemon@salesforce.com is the internal sender which sends email from organization's user's behalf.
postmaster@ email addresses are from domain from where this email bounces. And provide detailed error.