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https://www.inmotionhosting.com/support/email/mail-delivery-failed-returning-message-to-sender/
Oct 25, 2012 · So, you sent an email and it was returned or bounced back to you with a message like: Mail delivery failed: returning message to sender Errors like this are generally encountered when there is an issue on the recipient server, or the intended recipient does not exist on the remote server.Author: Jacob Nicholson
https://www.inmotionhosting.com/support/email/find-email-delivery-failures-in-exim/
871 [email protected] "Mail delivery failed: returning message to sender ... T="Mail delivery failed: returning message to sender" for [email protected] Copy the messaged ID following R=, so in this case it would be 1TvYvW-00069r-Au; Using the message ID you copied, ...
https://blog.dhampir.no/content/exim4-line-length-in-debian-stretch-mail-delivery-failed-returning-message-to-sender
Exim4 line length in Debian Stretch – “Mail delivery failed: returning message to sender” Unknown bolt 2017-07-09. Exim4 introducted new behaviour in the versions included in Debian Stretch. Suddenly, the RFC max line length of 998 characters is enforced, and emails with lines exceeding this length are returned to sender.
https://bobcares.com/blog/exim4-mailing-to-remote-domains-not-supported/
Nov 27, 2018 · Subject: Mail delivery failed: returning message to sender This message was created automatically by mail delivery software. ... Install mail server. In cases where Exim4 MTA is not installed at all, we install and configure the mail server first. 2. Mail server configuration.
https://serverfault.com/questions/341507/smtp-unroutable-address
SMTP unroutable address. Ask Question Asked 8 years, 3 months ago. ... Mail delivery failed: returning message to sender This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. ... I looked at the configs under /etc/exim4/conf.d/ but couldn't make sense ...
https://serverfault.com/questions/455322/exim-prevent-mail-sent-by-relay
----- Forwarded message ----- From: Mail Delivery System Date: Wednesday, December 5, 2012 Subject: Mail delivery failed: returning message to sender To: [email protected] This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients.
http://www.exim.org/exim-html-3.20/doc/html/spec_39.html
When a message fails to get delivered, or remains on the queue for more than a configured amount of time, Exim sends a message to the original sender, or to an alternative configured address. The text of these messages is built into the code of Exim, but it is possible to change it, either by adding a single string, or by replacing each of the ...
https://dhjtyl.blogspot.com/2019/02/my-server-is-being-used-for-spam.html
I´m using ubuntu and exim4. Apparently someone got access to my server and there is a malicious script running. Using the command exim -bp i get a list of queued emails in exim4 and using the command exim -Mvh to see the message headers i get this: 1gcGuH-00074u-5n-H Debian-exim 114 119 <> 1545860401 0-ident Debian-exim-received_protocol local
https://forums.cpanel.net/resources/reading-and-understanding-the-exim-main_log.383/
Nov 06, 2014 · sender_on_delivery: The message’s sender address is added to every delivery and bounce line, tagged by F= (for “from”). This is the original sender that was received with the message; it is not necessarily the same as the outgoing return path: size_reject: A log line is written whenever a message is rejected because it is too big. skip ...
https://techjourney.net/email-bounces-back-with-unrouteable-mail-domain-error/
Another possible cause for “unrouteable mail domain” problem when sending mail generated by PHP scripts is the security feature of the web host and Apache HTTPD PHP module.
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