Hi @joeyk :
Just thought I’d update you on this issue and for anyone else who happens to stumble across this issue/thread:
This issue happens in the case of delayed bounces.
SendGrid replied to my ticket:
After checking from our end I can see that all emails are being processed and delivered correctly but then are being bounced on the recipient side.
This behavior happens when mail is initially accepted for delivery but later refused after the SMTP dialogue has ended. Because the original SMTP connection was ended upon delivery confirmation, a new dialogue is initiated, with most of the previous context lost.
As a result, delayed bounces lack a linked IP address and other information, such as the message ID.
Due to the lack of the message ID, these delayed bounces won’t reflect into the Email Activity Feed since the Activity feed relies on msgid to display the data.