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https://serversmtp.com/smtp-error/
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https://serverfault.com/questions/565716/iis7-smtp-constant-send-failures
I am having an intermittent issue with sending mail via my asp.net mvc application. It doesn't always happen, but it is happening a lot. Here are some of the errors: Message delivery to the host ...
https://social.technet.microsoft.com/Forums/en-US/5fad739d-c551-4785-b6dd-f0fe3777db4e/an-smtp-protocol-error-occurred-while-sending-emails-to-external-domain
Apr 05, 2017 · For the failure ones I am getting the a bounce emails from postmaster@win... as 'Undeliverable' message, with the body as "This is an automatically generated Delivery Status Notification. Delivery to the following recipients failed..." 2. Do this event always arise when send message to external, or some special source?
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online
If a message sender received this NDR when they attempted to send a message to your group, and you want them to successfully send messages to your group, try one of the following steps: Remove the sender restriction : Change your group settings to unblock the sender in one of the following ways:
https://www.experts-exchange.com/questions/24970581/Message-delivery-to-the-host-failed-An-SMTP-protocol-error-occurred.html
After that, the message above started to appear and the emails are stored in the queue of the microsoft smtp server (built in iis7). What did we do..? It works fine sending to some domains (like live.com and gmail.com) but many of the other recipient domains are failing on this..
https://support.google.com/a/answer/3221692?hl=en
The status codes provide additional information. Each digit in these codes carry their own precise meaning: the first digit denotes the code class, the second digit indicates the subject, and the third digit provides more detail.
https://www.lifewire.com/smtp-error-messages-1166422
Dec 20, 2019 · An SMTP error's three numbers get us a detailed list of ESMTP/SMTP server response codes, as laid down in RFC 821 and later extensions: 211 - A system status message. 214 - A help message for a human reader follows.Author: Heinz Tschabitscher
https://forums.asp.net/t/2105304.aspx?Message+delivery+to+the+host+some+IP+Like+failed+while+delivering+to+the+remote+domain+test+com+for+the+following+reason+The+remote+server+did+not+respond+to+a+connection+attempt+
Oct 10, 2016 · Message delivery to the host '[some IP Like]' failed while delivering to the remote domain 'test.com' for the following reason: The remote server did not respond to a connection attempt.
https://www.socketlabs.com/blog/smtp-monitoring/
Well, monitoring and reporting on message failures is a complex task, especially for asynchronous failures. This is because the SMTP protocol requires asynchronous failures to be sent to the return path of the message as an NDR (Non Delivery Report), rather than the original sending server.
http://www.gettingemaildelivered.com/what-those-smtp-error-codes-mean-and-why-you-should-care
Ramesh, Please bear in mind that 550 could also mean that the user’s mailbox is full. Different ISP’s respond differently in this regard, so if after a few tries (say 2-3 tries) you’re still not getting mail delivered, it’s probably safe to temporarily remove the subscriber from your list (try again in a subsequent mailing).
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