Yahoo Inc

Yahoo Inc is a division of the internet service provider Verizon Communications, headquartered in New York City. It's known for its freemail services AOL and Yahoo!. Yahoo Inc provides a detailed Postmaster page with contact options for investigating false-positive spam verdicts. Some senders may also qualify for their "Email Marketing Data Feeds" with detailed insight on performance in the inbox.

Domains

  • yahoo.com
  • aol.com
  • verizon.net
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421All 421 codes →

smtp;421 Service not available, closing transmission channel

Low severity

smtp;421 Max message per connection reached, closing transmission channel

smtp;421 4.7.0 [TSS04] Messages from 0.0.0.0 temporarily deferred due to user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes

High severity

450All 450 codes →

smtp;450 User is receiving mail too quickly

Medium severity

451All 451 codes →

smtp;451 example.yahoo.com Resources temporarily unavailable. Please try again later [#4.16.1].

Low severity

smtp;451 4.3.2 Internal server error

452All 452 codes →

smtp;452 temporary domain failure <example@example.com>

501All 501 codes →

smtp;501 Syntax error in parameters or arguments

550All 550 codes →

smtp;550 relaying denied for <example@example.com>

552All 552 codes →

smtp;552 1 Requested mail action aborted, mailbox not found

553All 553 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

554All 554 codes →

smtp;554 delivery error: dd This user doesn't have a example.com account (example@example.com) [-9] - example.yahoo.com

smtp;554 delivery error: dd Sorry, your message to example@example.com cannot be delivered. This mailbox is disabled (554.30). - example.yahoo.com

smtp;554 delivery error: dd Requested mail action aborted - example.yahoo.com

smtp;554 5.7.9 Message not accepted for policy reasons. See https://postmaster.yahooinc.com/error-codes

smtp;554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit https://postmaster.yahooinc.com/error-codes

High severity

smtp;554 Message not allowed - Headers are not RFC compliant[291]

smtp;554 Message not allowed - [299]

smtp;554 delivery error: dd example@example.com is no longer valid. [-20] - example.yahoo.com

Other email providers

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