SMTP Code 553

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

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Email service providers

GmailAll Gmail codes →

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smtp;553 5.1.2 The recipient address <.@gmail.com> is not a valid RFC-5321 address. - gsmtp

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Spam filters services

SymantecAll Symantec codes →

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smtp;553 Message filtered. Refer to the Troubleshooting page at http://www.symanteccloud.com/troubleshooting for more information. (#5.7.1)

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Other SMTP codes