Mail IP Blacklist by Yahoo

If your email is blaklisted by Yahoo, users will receive the following bounced back message.

Bounced Back Message:
421 4.7.0 [TS01] Messages from <0.0.0.0> temporarily deferred due to user complaints -
<0.0.0.0> ; see http://postmaster.yahoo.com/421-ts01.html

First find out the cause and resolved the matter.
Then visit the link below to request for removal from blacklist by Yahoo.

http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html

  • 32 Users Found This Useful
Was this answer helpful?

Related Articles

Why Mail Sent to Mailing List Members is Rejected

Mailing list is a feature to allow users to forward mails to multiple recipients within the same...

Bounced Message "Sender verify failed"

The bounced back message below is received by the sender. "Sender verify failed"To prevent...

Why Email Falls into Junk/Spam Category

Every mail server may apply different spam filtering mechanism to filter out junk mails from...

Email Configuration Recommendations

There are two protocols that is frequently in use to retrieve email contents, which is POP3 and...

SMTP error codes for Yahoo Mail

https://help.yahoo.com/kb/smtp-error-codes-sln23996.html