GMAIL intermittently responding with "user unknown" bounces instead of accepting legitimate email
Last updated 2022-04-21 ·Reference W-8584904 ·Reported By 31 users
Currently GMAIL is responding with bounces in some scenarios when messages should actually be delivered as the subscribers are legitimate. The bounce messages would look like this:
Diagnostic-Code: smtp; 550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at
550 5.1.1 https://support.google.com/mail/?p=NoSuchUser
1. Send to Gmail to known good subscriber
2. See/receive bounces from known good subscribers with engagement
Currently we are recommending that clients do not send to Gmail subscribers in order to avoid these illegitimate bounces in the short term. In the long term, subscribers that were sent to can be re-activated once Gmail remediates this problem.
Gmail has reported this as an issue and is providing updates as they go.
A knowledge article that details how to re-activate subscribers that were affected by this can be found here:
Reported By (31)
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