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https://community.cisco.com/t5/email-security/delivery-expired-message-too-old/td-p/1718811
Re: Delivery expired (message too old) I noticed the same issue on a customer ESA and wanted to share my findings. You will likely see a high Active Recipient count when looking at the ESA GUI > Monitor > Delivery Status or via cli typing > tophosts then Active Recipients.
https://social.technet.microsoft.com/Forums/exchange/en-US/efadbb22-88f0-4ef4-ba65-5afd1ffae991/547-delivery-expired-message-too-old
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https://www.experts-exchange.com/questions/29017041/5-0-0-smtp-5-4-7-Delivery-expired-message-too-old-'EOF'-delivery-attempts-0-SMTP.html
May 02, 2017 · I've been told by my customer that they are getting this NDR: #< #5.0.0 smtp; 5.4.7 - Delivery expired (message too old) 'EOF' (delivery attempts: 0)> #SMTP# when sending email to one of the accepted email domain in my Exchange server. What does it means and where does the email being hold up before it is expired and discarded?
https://www.hmailserver.com/forum/viewtopic.php?p=211210
Apr 23, 2019 · 5.4.7 - delivery expired (message too old) [default] '[errno 60] Operation timed out' Use this forum if you have installed hMailServer and want to ask a question related to a production release of hMailServer. Before posting, please read the troubleshooting guide. A large part of all reported issues are already described in detail here.
https://community.cisco.com/t5/email-security/smtp-5-4-7-delivery-expired-unable-to-reach-nameserver-on-any/td-p/1397200
SMTP 5.4.7 - Delivery expired - unable to reach nameserver on any valid IP We recently started having issues delivering email to hotmail.com, aol.com, and amtrak.com addresses (possibly more domains, but
https://productforums.google.com/forum/#!topic/gmail/5zJnF9qF2DM
Delivery expired (message too old) '[Errno 61] Connection refused' (delivery attempts: 0) Please advise what could be causing this issue - and how I might be able fix it on my end. [I use Gmail with my domain email, using Microsoft Entourage email client. I just confirmed, all smtp configuration seems to be correct:
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