One particular user in a company cannot receive emails from an external party. Other people in the company can, but this one particular person cannot and it's been going on for sometime.
I got the external sending party to forward one of the rejection messages which is shown in the code snippet window.
I do notice it looks like the external sender is actually going through google mail (although their main email address is not a Google email address).
If the same external person emails another person in the company of the person not receiving emails, the email makes it through fine.
The receiving party has an exchange server behind a barracuda spam firewall, but the barracuda shows no sign of the email ever making it to the company (it logs all that it rejects).
What could be causing this?
From: Mail Delivery Subsystem <firstname.lastname@example.org>
Subject: Delivery Status Notification (Delay)
This is an automatically generated Delivery Status Notification
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipient has been delayed:
Message will be retried for 2 more day(s)
Technical details of temporary failure:
Unspecified Error (SENT_RCPT): Connection timed out
----- Message header follows -----