Yahoo Mail

Yahoo Mail SMTP Error Codes

Yahoo Mail SMTP Error codes.

If you greceive a SMTP error code, after you have sent an email to a Yahoo Mail (Ymail) account, you can look up the various error codes here, as well as their causes.

The most common SMTP server error codes are: Smtp 421 error, Smtp 451 error, Smtp 550 error, Smtp 553 error and the Smtp 554 error codes.

Common SMTP Error Codes and Causes.

Smtp Error Code Error Message Possible Reasons
SMTP 421 Error 421 Message temporarily deferred – [numeric code] Objectionable email message content.

Emails from your mail server are generating complaints from Yahoo Mail (Ymail) users.

Yahoo Mail is seeing unusual traffic from your servers, or

SMTP 421 Error 421 4.7.0 [TS01] Messages from x.x.x.x temporarily deferred due to user complaints – 4.16.55 Yahoo Mail is seeing unusual traffic patterns from your server.
SMTP 421 Error 421 4.7.0 [TS02] Messages from x.x.x.x temporarily deferred due to user complaints – 4.16.55 Yahoo Mail is seeing unusual traffic patterns from your server.

Your emails are generating complaints from Yahoo Mail (Ymail) users

SMTP 421 Error 421 4.7.1 [TS03] Messages from x.x.x.x permanently deferred. Retrying will NOT succeed Yahoo Mail is getting a high volume of emails from your server which is indicative of “Spam” or “unsolicited emails”.
SMTP 451 Error 451 Resources temporarily not available – Please try again later [numeric code] The Yahoo Mail servers were busy and temporarily unable to process your email at the time of your connection.
SMTP 451 Error 451 VS1-IP Excessive unknown recipients – possible Open Relay (#4.1.8) Your email server configuration is an open relay/proxy.
SMTP 451 Error 451 VS1-MF Excessive unknown recipients – possible Open Relay (#4.4.5) Your MAIL FROM email address has sent emails to an excessive number of bouncing accounts (non-active, or non-existing). Update your mailing lists, and remove all email addresses, that generate a rejection/bounce.
SMTP 553 Error 553 5.7.1 [BLXX] Connections not accepted from IP addresses on Spamhaus PBL Your IP or your server IP is listed on a Spamhaus blacklist. Check your status on the Spamhaus.org/lookup website
SMTP 554 Error 554 Message not allowed – [numeric code] Your emails are down-prioritized due to the email message content. The content trigger a Yahoo Mail filters. Check your emails header and/or message content for any objectionable content.
SMTP 554 Error Delivery error: dd This user doesn’t have a yahoo.com account (******@yahoo.com) [-5] – mta1126.mail.gq1.yahoo.com [BODY] The Yahoo Mail email account that you are sending an email to does not exist.

Contact the recipient to confirm their correct Yahoo email address.

Check that you have not left out any part of the receiveing email address.

Check that you are sending to the correct country specific email address, such as @yahoo.fr, @@yahoo.es, @yahoo.co.uk, @yahoo.com

SMTP 554 Error 554 5.7.9 Message not accepted for policy reasons Your message wasn’t delivered because Yahoo was unable to verify that it came from a legitimate email sender.

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