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https://kc.mcafee.com/corporate/index?page=content&id=KB69739
Mar 01, 2017 · SMTP errors 4.x.x are persistent transient failures. A persistent transient failure is one in which the message sent is valid, but some temporary event prevents the successful sending of the message. 3405 IN MX mail.domain01.com.br Test the connectivity between the …
http://zawazawa-kango.hatenablog.com/entry/20120201/p1
--- The following addresses had delivery problems ---(No delivery mechanism available.) Original-Recipient: Action: failed Diagnostic-Code: smtp; 442 No delivery mechanism available. Remote-MTA: xxx.xxx.xxx.xxx. うちの病院のMXが引けてないのかな−？ 訳わからん。このblogをみてくれている人で、 …
https://grokbase.com/t/php/pear-bugs/117x7zf2nz/pear-bug-req-18693-opn-csd-decoding-of-message-delivery-status
[PEAR-BUG] Req #18693 [Opn->Csd]: decoding of message delivery status; Alan. Jul 29, 2011 at 3:13 am: ... Summary: decoding of message delivery status-Status: Open +Status: Closed Type: Feature/Change Request Package: Mail_mimeDecode Operating System: debian ... smtp; 442 No delivery mechanism available. Remote-MTA: x.x.x.x
https://en.wikipedia.org/wiki/List_of_SMTP_server_return_codes
These return codes have been in SMTP from the beginning, with RFC 821 in 1982, but were extended rather extensively, and haphazardly so that by 2003 RFC 3463 rather grumpily noted that: "SMTP suffers some scars from history, most notably the unfortunate damage to the reply code extension mechanism by uncontrolled use." 1xx Informational
https://www.usps.org/info/smtp_status.html
SMTP Status Codes The leading character "X" is 4 for temporary errors and 5 for permanent ones. ... X.4.7 Delivery time expired ... [BASE64] response which is longer than the maximum buffer size available for the currently selected SASL mechanism. This is useful for both permanent and persistent transient errors. X.6.0 Other or undefined media ...
https://kb.mcafee.com/resources/sites/MCAFEE/content/live/PRODUCT_DOCUMENTATION/23000/PD23663/en_US/MEG_701_2151108_readme_en_US.pdf
ISSUE: The appliance allows configuration of per-domain SMTP relays. When a large number of SMTP relays was present, incorrect configuration was being saved by the GUI resulting in emails being queued with the message '442 No Delivery Mechanism Available'. RESOLUTION: The GUI implementation has been modified to ensure large number
https://blog.mailtrap.io/smtp-commands-and-responses/
Aug 14, 2019 · In the blog post SMTP vs. IMAP vs. POP3, we explained that an SMTP session is a sort of a conversation between an SMTP client and an SMTP server.The client talks using commands that consist of alphabetical characters. The server responses with …
https://sendpulse.com/knowledge-base/smtp/smtp-errors-email-delivery-errors/smtp-errors-codes
SMTP Errors and Email Delivery Errors ... 421 — The service is not available, the transmission channel is closed. ... 442 — The mail server started to deliver the email, but the connection was dropped during transmission. 450 — The requested action was not taken; the mailbox is unavailable. It may be temporarily busy.5/5(8)
http://www.gettingemaildelivered.com/what-those-smtp-error-codes-mean-and-why-you-should-care
These are often in response to SMTP commands that have ‘gone wrong’ between your email server that sent the email, and the receiving email server that is unable to deliver it (or refuses to deliver it) for some reason. But what exactly do they mean? And why should you care? (‘SMTP’ stands for Simple Mail Transfer Protocol.)
https://supertekboy.com/2017/02/28/tls-negotiation-failed-with-error-nocredentials/
Ran into a strange problem recently where an Exchange 2016 server could not send mail to Office 365 via hybrid mail flow. What made this situation particularly strange is that other Exchange servers in the environment had no problem sending messages over the hybrid connection.
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