The mailserver that originated the email that reached a destination and was bounced
https://tools.ietf.org/html/rfc6533 (and before that RFC 3464) 2.3.5 Remote-MTA field The value associated with the Remote-MTA DSN field is a printable ASCII representation of the name of the "remote" MTA that reported delivery status to the "reporting" MTA. remote-mta-field = "Remote-MTA" ":" mta-name-type ";" mta-name NOTE: The Remote-MTA field preserves the "while talking to" information that was provided in some pre-existing nondelivery reports. This field is optional. It MUST NOT be included if no remote MTA was involved in the attempted delivery of the message to that recipient. From: mailop <mailop-boun...@mailop.org> on behalf of Luke Martinez via mailop <mailop@mailop.org> Reply-To: Luke Martinez <luke.marti...@sendgrid.com> Date: Thursday, 23 February 2017 at 1:14 PM To: mailop <mailop@mailop.org> Subject: Re: [mailop] Curious: Strange NDRs from gmail. Super helpful. Thanks. This may be a stupid question, but can you help me understand what "Remote-MTA" means in this context? I'm a little confused as to how that works.
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