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https://support.microsoft.com/en-us/help/303734/how-to-configure-the-smtp-virtual-server-for-message-delivery
Apr 16, 2018 · If the reverse DNS lookup is successful, the Received header remains intact. If the verification is unsuccessful, "unverified" appears after the IP address in the Received header of the message. To enable reverse DNS lookup, follow these steps: In the MMC, click to select the SMTP virtual server, and then click Properties on the Action menu.
https://serversmtp.com/email-delivery-notification/
turboSMTP comes with a delivery notification system that tracks down your email delivery rate (and the single status of every message) in real-time, with useful information about bounces, queued emails and spam complaints.
https://tools.ietf.org/html/rfc1891
The Delivery Status Notification service extension An SMTP client wishing to request a DSN for a message may issue the EHLO command to start an SMTP session, to determine if the server supports any of several service extensions.Author: K. Moore
https://dl.icewarp.com/online_help/203030105.htm
Understanding the SMTP protocol and message headers To implement Rules properly, you should understand the structure of an emails and how they are transferred via the SMTP protocol. An email is transferred over the network using the SMTP protocol as a plain text file with a header and body part.
https://www.sendmail.org/~ca/email/dsn.html
In this document, I'll concentrate on what the Internet, i.e, (E)SMTP, has to offer for these topics. If you have any corrections or additions please let me know. Delivery Status Notification. Delivery Status Notification (DSN) is a function of the MTA. There are two different kinds: positive and negative delivery status notifications.
http://www.avolio.com/columns/E-mailheaders.html
A longer answer is, "the Firebox SMTP Proxy allows us to make security decisions based on headers, envelope information, and SMTP commands, and we should understand that which we can control." I recently looked at the SMTP proxy with you. We’ll now look more closely at e-mail headers and SMTP commands. The letter in the envelope
https://tools.ietf.org/html/rfc4021
RFC 4021 Mail and MIME Header Fields March 2005 Section 2.2 contains templates for initial registration of MIME header fields. 1.2. Document ... Provides the recipient with information about requested delivery but will not be acted on by the SMTP infrastructure. ...Author: Jacob Palme, Graham Klyne
https://mxtoolbox.com/EmailHeaders.aspx
ABOUT EMAIL HEADERS. This tool will make email headers human readable by parsing them according to RFC 822. Email headers are present on every email you receive via the Internet and can provide valuable diagnostic information like hop delays, anti-spam results and more.
https://serverfault.com/questions/1002751/smtp-delivery-failure-headers
According to my research, Microsoft Exchange 2010 includes a feature called a header firewall that strips X-headers from untrusted sources (the internet) and this sort of thing exists in some SMTP security gateways too. Many admins will strip almost all non-critical headers off a message as it leaves to obscure any internal information.
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