Email provider · 4.x.x transient failure
Every SMTP 452 response on record from Google (gmail.com, googlemail.com), with the verbatim text, the enhanced status code, a severity rating and a plain-English fix.
The action failed because the server is short on a resource, typically storage or the number of recipients it will take in one session. Sending fewer recipients per message, or simply retrying later, usually works.
smtp;452 4.2.2 The email account that you tried to reach is over quota. Please direct the recipient to https://support.google.com/mail/?p=OverQuotaTemp - gsmtp
The recipient's mailbox is temporarily full. The retry may succeed once they free up space; nothing to change on your end.
Postmaster & documentation
The action failed because the server is short on a resource, typically storage or the number of recipients it will take in one session. Sending fewer recipients per message, or simply retrying later, usually works. At Google, it is a temporary deferral that is retried automatically, and the specific reason is in the enhanced status code and message text of each response below.
Match your bounce text to one of the responses below and follow its guidance. Recipient-side wording means fix the address. Authentication or reputation wording (SPF, DKIM, DMARC, blocklist) means fix your sending setup, and check Google's postmaster documentation.
