Couldn’t find any results!

Powered by Algolia

SMTP Error Code 551

The transaction failed permanently. The server will not try to send the message again.

Jump to ↓

▒▒▒▒▒░░█▓▒▓▓▓▓▓▓▓▓▓▒░░▒▓▒▒█▒▓▓▓▓▓▓▓▓▓▓▓██▓░▓▓░▓▓▓▓▓▓▓▓▓░▒░░██▓▒▓▒▒▒░▓▓▓▓▓▓▓▓▓░▒█▒▓█▒▒██░▒▒░▓▒▒░▓░▒▒░▓▓▓▓▓▓▓▓▓▓▓▒█░▓▓▓▓▓▓▓▓▓░▒░▓▓▓▓▓▓▓▓▓█▓▓▓▓▓▓▓▓▓▓▓▓▓▒▓▒▒▒░▒▒█▓░░█▓▒▒░░▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▓▒░▓▓░▒░░▒▒▓▓▒▒▒▒▓▓▓▓▓▓▓▓▓█░▓█▒░▒▒░▒▒░▓▓▓▓▓▓▓▓▓█▒░░░▓░█▒▓░▒█░▒▓▓▓█▓▓░▒█▒░▒▓█▓▒▒░▒▒▓█░▓▒▓▓▒▒▒░░▒▒▓▒░▓▓▒░▒▒▒▓▓▓▓▓▓▓▓▓▓█▒▓▓▓▓▓▓▓▓▓▒█▒▓▒░▒▓▓▓▓▓▓▓▓▓▒░▓▒█▓░░░▓▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░▒▒▒▒▒▓▒░▒▓░▒▓▓█▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▓▒▒▓██░▓▓▒▒▓▒▓░▓▒▒░█░▒█▒▓▓█▓▒▓▓▓▓▓▓▓▓▓▒░░▒░▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓█▓░▓▓▓▓▓▓▓▓▓▓▒▓▒▓▓▓▓▓▓▓▓▓▓▒█░▓▒▓▓▓▓▓▓▓▓▓░░░▒▒██▓▒▒▓░▓░▓░▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▓▓▓▓▓▓▓▓▓▒▒▓▓▒░▓▓▓▓▓▓▓▓▓▓░█░█░▓▓▓▓▓▓▓▓▓▒▒▓▒▓▓▓▓▓▓▓▓▓▓▒▓▓▒░░▓█▓▓▒█▒█▓░░▒█▒░░░▓▓▓▓▓▓▓▓▓█▓▒▒▓▒█▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░▒░░▓▓▓▓▓▓▓▓▓▓▒█▒█▓▓▒░█▒▓▓▓▓▓▓▓▓▓▓▓▒▒█▒▓▓▓▓▓▓▓▓▓▓▓▒▒░▓░░▓▒░▓▒▓▒▓░▒▒▒▓▒▓▓▓▓▓▓▓▓▓▓▒█▓▒░▒▒▒▒▒▒▒▒▓██▓▓▓▓▓▓▓▓▓░▓▒▒▓▒░▒▒▒▓▓▓▓▓▓▓▓▓▒░▓▓▓▓▓▓▓▓▓▒█▒█░▓▒▒▓▓▓▓▓▓▓▓▓▒▒▒▓▓▓▓▓▓▓▓▓░▓▒▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▒█▒░▓▓▓▓▓▓▓▓▓░▓▓▒▓▓█░▓▓▓▓▓▓▓▓▓░▒█▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░█

Email service providers

ImprovMXAll ImprovMX codes →

smtp;551 5.7.1 Due to the very low reputation of the sending domain, this message has been blocked (Code 2).

smtp;551 5.7.1 Loop detected: Email is sent and forwarded from/to improvmx.com. (#id-5.9.0)

smtp;551 5.7.1 Domain not found (#id-5.9.2)

smtp;551 5.7.1 Our database returned invalid pieces of information about the requested recipient’s domain (#id-5.9.3)

smtp;551 5.7.1 Unable to correctly read the forwarding recipient (where to forward the email to) (#id-5.9.5)

YandexAll Yandex codes →

smtp;551 5.3.0 Unknown error

Other SMTP codes

Brought to you by Postmark.
A super reliable email platform for web applications.

Built with

░▓▓▓▓▓▓▓▓▓▓▒█▒▓▓▓▓▓▓▓▓▓▒█▓█▒▒▓░▒▓▓▓▓▓▓▓▓▓▓▒▓▒▒▒█░▒▒▒▓░░░▓▒░▓▒▒░▓▓▓▓▓▓▓▓▓▓▒▓▓▓█░▓▒▒▒▓▒░▓▓▓▓▓▓▓▓▓▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓░▒░▓██▓▓▒▒▓░▒▒▒▓▓█▓▓░▒░░▓░▓▒▓░▓▓▓▓▓▓▓▓▓▒▓▓█▓▓▓▓▓▓▓▓▓▒░█▒▓▓▓▓▓▓▓▓▓░▓▓▓▓▓▓▓▓▓▓░▒▒▓▓░▒▒▓░▓▓▒▓▓▓▓▓▓▓▓▓█▓░▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░▓▒██▓▓▓▓▓▓▓▓▓░░▒▓▓▓▓▓▓▓▓▓░▒▓░░▓▓▓▓▓▓▓▓▓▒▒█░▒█▒░▓▓▓▓▓▓▓▓▓▒▓▒▓█▓▒▒█░██░▓▓▒▓░▓▒▓▒▓▒█▒██▒█▓▒▓▓█▓▒▓▓░▒░▓▓▓▓▓▓▓▓▓░▒▓▒▓▓▓▓▓▓▓▓▓▓▒░▓▒▒▓▓▓▓▓▓▓▓▓▒▓▒░░▓▒█░░▓▓▒█░░▒▒░▒▓▒▓█▒▒▓░▓▓██▒░░▓▓▓▓▓▓▓▓▓█▒▓█░▓▓▓▓▓▓▓▓▓▓▒▓▒▒█▒▓▓▓▓▓▓▓▓▓▓▒▓▓▒▒▓▒█░▓█▒▒█░▒▓▓▒░▓▓▓▓▓▓▓▓▓█▓▓▓▓▓▓▓▓▓░▓▓▓▓▓▓▓▓▓▒█▒░░█▒░█▒▒▓▓▓▓▓▓▓▓▓░▒▓▓▒▓▓▓▓▓▓▓▓▓░▒░▓▓▓▓▓▓▓▓▓░▒░▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░▒▒░▓▓▓▓▓▓▓▓▓██▒▓▓▓▓▓▓▓▓▓▓░▓▓▓▓▓▓▓▓▓▓█▒▒▒▒░░▒▒▓░▒▓▓▓▓▓▓▓▓▓█▓▓▓▓▓▓▓▓▓░▓▓▓▓▓▓▓▓▓█▒▒▓░▓▓▓▓▓▓▓▓▓▓▒▒▓▒▓░░▒░░▓░▒▓▓▓▓▓▓▓▓▓▓░▒▒▒▒▓▓▓▓▓▓▓▓▓▒▒▓▒▓▓▓▓▓▓▓▓▓▒█░█▒▓▓▒▓▓▓▓▓▓▓▓▓█░▒▒░▓▒▓▓▓▓▓▓▓▓▓▓▓▓▒░█▒▓▓▓▓▓▓▓▓▓▒░▓▒░░▓▓▓▒░▒▓▓█▓▒▒░▒▒▒▓▒▒░█▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░▓▒▒▒█░▒▓░█▓▒▒▓▓░▒▓▓▓▓▓▓▓▓▓█▒▒▓░▓▒▓▓▓▓▓▓▓▓▓▒▒▓▒▒▒░▓▓▓▓▓▓▓▓▓▒░░▓▓▓▓▓▓▓▓▓▓▓█▒▓▓▓▓▓▓▓▓▓▓▒▒░░▓▓▓▓▓▓▓▓▓▒▒▒░▒▓░▓▓▒░▒▒▒▒█▓▓▒▓▓▓