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https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/mail-delivery-failed/b20f2d35-a718-4846-b392-ec0c8a429b48
Oct 06, 2015 · Mail delivery failed I have a custom domain through 1and1.com, and I forward my emails to my live.com email account that uses my custom domain email address as an alias. (The mail is also still delivered to the 1and1.com email server.)
https://www.ionos.com/help/email/troubleshooting-mail-basicmail-business/error-messages-caused-by-undeliverable-email/
You have sent an email and received a notification that your email has not been delivered to the recipient. You can recognize such emails by the sender Mail Delivery System and the subject Mail delivery failed.These messages are often referred to as Bounce, Non Delivery Notification (NDN) or Non-Delivery Report/Receipt (NDR).
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https://www.ionos.co.uk/help/email/postmaster/smtp-error-messages-of-the-11-ionos-mail-servers/
The delivery of emails was temporarily delayed due to a constantly changing HELO/EHLO entry of the shipping server. Usually, email servers use a unique HELO entry per IP address. Changing HELO entries in the SMTP dialog indicate a potentially infected system that is being abused by a virus to send spam. ... 552 Requested mail action aborted ...
https://www.experts-exchange.com/questions/22485215/My-email-address-is-being-used-as-return-address-in-spamming-Help.html
1and1 accepts the mail and attempts to deliver the message to you but they always rewrite the SMTP envelope and 1and1 uses your alias/proxy email address <proxy465014@1and1-private-registrat ion> (the same address it just accepted mail for) and then tries to relay it to your server and <phil@vantagecrest>.
https://forum.iredmail.org/topic8938-iredmail-support-550requested-action-not-taken-mailbox-unavailable-550-invalid-dns.html
Apr 24, 2015 · I have the same issue with 1and1, and no one else. I have two domains, neither of which can send mail to 1and1 hosted users. I get "mailbox unavailable 550 invalid DNS MX or A/AAAA resource" when I try to email them, though the same recipient works fine from my google hosted domains.
https://www.wisevu.com/blog/how-to-stop-mail-delivery-system-failure-spam-emails/
We put together a video showing you how to prevent and stop email spammers from flooding your inbox with “Mail delivery failed: returning message to sender” emails from Mail Delivery System. If your inbox is flooded with emails from Mail Delivery System like you see in the photo below, and if you did not attempt to send any of these emails ...
https://security.stackexchange.com/questions/52045/keep-receiving-delivery-failures-for-emails-im-not-sending
Keep receiving delivery failures for emails im not sending. Ask Question Asked 6 years, 1 month ago. ... to sign all your outgoing mail so remote email servers can drop mail that either not signed or has a broken signature. ... Failed to send emails that I never sent.
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