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https://tools.ietf.org/html/rfc5321
RFC 5321 SMTP October 2008 transactions. In addition, an SMTP client may use a connection to an SMTP server for ancillary services such as verification of email addresses or retrieval of mailing list subscriber addresses. As suggested above, this protocol provides mechanisms for …
https://tools.ietf.org/html/rfc3461
RFC 3461 SMTP DSN Extension January 2003 In an attempt to provide such a service, this memo uses the mechanism defined in [] to define an extension to the SMTP protocol.Using this mechanism, an SMTP client may request that an SMTP server issue or not issue a Delivery Status Notification (DSN) under certain conditions.Author: K. Moore
https://wordtothewise.com/2014/01/does-email-have-a-guarantee-of-delivery/
Does email have a guarantee of delivery? January 30, ... But as I was mentioning this to Steve, he pointed out that there was a recent change in the RFCs for email. In both RFC 821/2 and RFC 2821/2 (the original email related RFCs and the update in the early 2000’s) the RFCs stated that once a receiving MTA accepted an email that that MTA was ...
https://en.wikipedia.org/wiki/RFC_822
Electronic mail (email or e-mail) is a method of exchanging messages ("mail") between people using electronic devices.Email first entered limited use in the 1960s, but users could only send to others who used the same computer, and some early email systems even required the author and the recipient to both be online at the same time, similar to instant messaging.
http://ietf.org/standards/rfcs/
Below are links to RFCs, as available from ietf.org and from rfc-editor.org. Note that there is a brief time period when the two sites will be out of sync. When in doubt, the RFC Editor site is …
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-4-1-in-exchange-online
The outbound connection attempt was not answered because either the remote system was busy or it was unable to take delivery of the message. Diagnostic information for administrators section. No answer from host. #550 5.4.1 Relay Access Denied ## Still need help? See also. Email non-delivery reports in Exchange Online. Related Articles
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/action-failed-status-400/f5dd2032-c6dc-412e-9ee9-3a954d831cff
Oct 20, 2015 · The system needs a few days to build your reputation. So, there are stricter limitations on new accounts or accounts that have engaged in activity that is representative of abusers sending spam. ... Note: Recipients is different from emails - 1 email with 5 recipients' counts as 5 emails, not 1.
https://www.iplocation.net/email-delivery-problems
Internet email system is a non-confirming delivery protocol, which means that there is a no guarantee that an email sent from you will be delivered to the intended recipient(s). We assume that an email will be delivered to a recipient if no "undeliverable" message is returned to you.
https://en.wikipedia.org/wiki/Greylisting
Greylisting is a method of defending e-mail users against spam.A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again after a delay, and if sufficient time has elapsed, the …
http://www.faqs.org/rfcs/rfc1893.html
RFC 1893 - Enhanced Mail System Status Codes. RFC 1893 - Enhanced Mail System Status Codes. faqs.org. ... X.5.X Mail Delivery Protocol Status The mail delivery protocol status codes report failures involving the message delivery protocol. These failures include the full range of problems resulting from implementation errors or an unreliable ...
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