![]() Encryption required for requested authentication mechanism 454 – TLS not available due to temporary reason.452 – Requested action not taken: insufficient system storage.451 – Requested action aborted: local error in processing Request is unable to be processed, try again.450 – Requested mail action not taken: mailbox unavailable.432 – Domain service not available, closing transmission channel.421 – Domain service not available, closing transmission channel.355 – Octet-offset is the transaction offset.253 – Pending messages for node started.252 – Cannot Verify user, will attempt delivery later.251 – Not Local User, forward email to forward path.250 – Requested mail action completed and OK.221 – Domain service closing transmission channel.211 – System status / system help reply.This list of codes is the standard SMTP error codes you will find in most email bounces. Below is a list of the Standard SMTP error codes and the Extended SMTP (ESMTP) error codes. ![]() If you receive an email bounce, you can look in the bounce message to find the proper error code that will give you the reason for the bounce. It is important to figure out why your email bounces.
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