SMTP Error Code 553

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

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Email service providers

GoogleAll Google codes →

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

Yahoo IncAll Yahoo Inc codes →

host xx.yahoodns.net [x.xx.xx.xx] SMTP error from remote mail server after MAIL FROM:<user@example.com> SIZE=2022: 553 5.7.1 [BL21] Connections will not be accepted from x.xx.xx.xx, because the ip is in Spamhaus's list; see http://postmaster.yahoo.com/550-bl23.html

Medium severity

host xx.yahoodns.net [x.xx.xx.xx] SMTP error from remote mail server after MAIL FROM:<user@example.com> SIZE=2022: 553 Mail from x.xx.xx.xx not allowed - 5.7.1 [BL23] Connections not accepted from IP addresses on Spamhaus XBL; see http://postmaster.yahoo.com/errors/550-bl23.html [550]

Medium severity

ZohoAll Zoho codes →

failed,5.1.1 (bad destination mailbox address),smtp;553 Relaying disallowed,mx.zoho.com

Spam filters services

Email Security.cloudAll Email Security.cloud codes →

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

smtp;553 you are trying to use me [xx.messagelabs.com] as a relay, but I have not been configured to let you [x.xx.xx.xx, example.com] do this. Please visit www.symanteccloud.com/troubleshooting for more details about this error message and instructions to resolve this issue. (#5.7.1)

Other SMTP codes

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