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https://www.experts-exchange.com/questions/24970581/Message-delivery-to-the-host-failed-An-SMTP-protocol-error-occurred.html
Last week we also worked with setting up ptr records, spf, smtp banner message and so on for matching recipients that requires that those things are set up ok. This because we …
https://forums.iis.net/t/1153808.aspx?SMTP+Server+not+sending+mail+under+IIS6
Dec 17, 2008 · Hi, I have a .net application that sends email using the SMTP server under the same IIS server. The site is hosting both mydomain.com and subdomain.mydomain.com.
https://arstechnica.com/civis/viewtopic.php?t=1125539
Oct 19, 2010 · Not in this situation in my experience. However, the recipient domain may have a way of removing your ip/domain from their blacklist on their website.
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