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https://support.office.com/en-us/article/I-receive-a-550-553-or-relay-prohibited-error-when-sending-email-messages-65b494a4-0a15-433e-829f-e73651e0245e
Unsolicited commercial email is sometimes called junk mail or spam. The main reason that junk email continues to increase in volume is that it costs the person who sends it virtually nothing to send; in fact, the senders don't even have to send the junk email through the SMTP (outgoing) email …
https://www.inmotionhosting.com/support/email/email-error-553/
Oct 26, 2012 · A 553 email error is normally related to SMTP authentication not being used. Most mail servers require that you authenticate with a valid user on that system, before you're allowed to relay a remote message out. However some mail administrators will also using the 553 error if …Author: Jacob Nicholson
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_other-mso_archive/receiving-multiple-mail-delivery-system-errors/5bdb2028-42a9-4e3b-8cfc-7206cb7569b0
Jan 11, 2014 · Yesterday, I started receiving about 20 Mail Delivery System Notfications that Outlook was unable to deliver the message. It turns out each address is different and located in China. I never sent an email to any of the intended receipents. Body of the text looks like this: This is an automatically generated Delivery Status Notification.
https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
These terms are used when your message has been intentionally blocked by a spam or blacklist filter on the recipient's email server. The recipients server believes that the mail server or mail account that you're using is a source of spam.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online
The MX record for a domain that's enrolled in Exchange Online uses the syntax <domain>.mail.protection.outlook.com. Verify MX Record and Outbound Connector Test at Office 365 > Mail Flow Configuration in the Microsoft Remote Connectivity Analyzer. Verify you have only one MX record configured for your domain.
https://www.usps.org/info/smtp_status.html
This code may represent a permanent failure or a persistent transient failure. X.3.0 Other or undefined mail system status - Code: 421, 451, 550, 554 The destination system exists and normally accepts mail, but something about the system has caused the generation of this DSN.
https://www.lifewire.com/ignore-delivery-failures-of-unsent-messages-1174019
Nov 14, 2019 · Since email delivery usually works (or at least did before overzealous spam filters started blocking legitimate mail), success is not normally reported but failures are. If you have ever mistyped an email address I'm sure you know the often detailed, not always easy to parse but usually alarming "delivery failure" messages.Author: Heinz Tschabitscher
https://www.lifewire.com/mailer-daemon-spam-4135595
If you found infections, do clean your machines and change all passwords, especially those to your email and social accounts. Report the mailer-daemon spam as junk mail in your email program or service. This has the spam filter drop similar useless and annoying delivery failure emails in the future.Author: Heinz Tschabitscher
https://serversmtp.com/smtp-error/
“Requested mail actions aborted – Exceeded storage allocation”: simply put, the recipient’s mailbox has exceeded its limits. Try to send a lighter message: that usually happens when you dispatch emails with big attachments, so check them first. 553 “Requested action not taken – Mailbox name invalid”.
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