Status 4.7.0#
smtp;421 4.7.0 me.com Error: too many errors
You are sending faster than this receiver currently accepts from you. Slow down and the automatic retry will deliver the queued mail.
Provider documentation
Email provider · 4.x.x transient failure
Apple SMTP 421 Errors: Every Bounce Response Explained
Every SMTP 421 response on record from Apple (icloud.com, me.com, mac.com), with the verbatim text, the enhanced status code, a severity rating and a plain-English fix.
The service is temporarily unavailable and the connection is being closed. The receiver is telling the sender to back off and reconnect shortly. It usually comes from rate limiting, a full queue, or a brief reputation check on an unfamiliar sender.
- Provider
- Apple
- Code
- 421 (4xx)
- Responses
- 2
- Highest severity
- Medium
Apple SMTP 421 responses
smtp;421 4.7.1 Messages to [email protected] deferred due to excessive volume. Try again later - https://support.apple.com/en-us/HT204137
You are sending faster than this receiver currently accepts from you. Slow down and the automatic retry will deliver the queued mail.
Provider documentation
Postmaster & documentation
Apple SMTP 421 questions
›What does an SMTP 421 error from Apple mean?
The service is temporarily unavailable and the connection is being closed. The receiver is telling the sender to back off and reconnect shortly. It usually comes from rate limiting, a full queue, or a brief reputation check on an unfamiliar sender. At Apple, 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.
›How do I stop Apple from returning SMTP 421?
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 Apple's postmaster documentation.