Verizon

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421All 421 codes →

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smtp;421 Service not available, closing transmission channel

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

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smtp;421 4.7.0 [TSS04] Messages from 0.0.0.0 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

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450All 450 codes →

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smtp;450 User is receiving mail too quickly

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451All 451 codes →

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

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smtp;451 4.3.2 Internal server error

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501All 501 codes →

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smtp;501 Syntax error in parameters or arguments

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550All 550 codes →

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

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554All 554 codes →

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

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

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

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smtp;554 5.7.9 Message not accepted for policy reasons. See https://help.yahoo.com/kb/postmaster/SLN7253.html

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smtp;554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit https://help.yahoo.com/kb/postmaster/SLN5067.html [120]

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

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smtp;554 Message not allowed - [299]

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