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https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/delivery-status-notification-550/d8bf7499-adad-4496-94b3-40d763028597
Mar 23, 2015 · delivery status notification 550 Many times if I reply to an email message on Microsoft Outlook I get an email from Mail Delivery System. Subject: Delivery Status Notification.
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
Delivery: If Route mail through smart hosts is selected, confirm the correct IP address or FQDN is specified. If MX record associated with the recipient domain is selected, confirm the MX record for the domain points to the correct mail server.
https://bobcares.com/blog/550-email-blocked/
Sep 29, 2018 · The mail system : host smtp.recipient.coml[XXX.211.XXX.31] said: 550 Email blocked by hostkarma.junkemailfilter.com (in reply to RCPT TO command) It means that the recipient’s mail server smtp.recipient.com rejected the mail from mx.sender.com because the spam filter at junkemailfilter.com classified the mail as spam.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-1-through-5-1-20-in-exchange-online
Their rule could have tried to send a copy of your message to a bad email address. If the recipient has such a rule, they'll need to correct the destination email address or remove the rule in order to prevent 5.1.x message delivery errors. Solution 4: Verify that your account hasn't been compromised. Did you send the original message at all?
https://itsyndicate.org/blog/550-permanent-failure-for-one-or-more-recipients/
How to fix ‘550 permanent failure for one or more recipients’ and similar errors
https://appuals.com/fix-smtp-error-550-when-sending-email/
SMTP authentication failure – Another possible scenario is that the message was by sending SMTP due to an SMTP authentication failure. Receiving mail server is down – Although this is a very rare occurence, there’s a chance that the receiving mail server is down and cannot process your sending request.
https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
Delivery failures, or emails that bounce or come back as undeliverable, can happen for several reasons. When you send an email and receive a delivery failure message, there could be several reasons.
https://clients.websavers.ca/whmcs/knowledgebase/135/You-receive-a-bounce-email-with-error-550-Message-rejected.html
In the case of email being sent to BellAliant email addresses, if the recipient adds your email address to their address book in webmail, your address will be automatically whitelisted and your newly composed emails should be received successfully without a bounce.
https://support.google.com/mail/thread/13110497?hl=en
I'm having problems sending emails to one specific email address. I can receive emails from them, however when I try to reply all I get is the 550 blocked message.
https://bobcares.com/blog/550-spf-check-failed/
Nov 26, 2018 · In short, “550 spf check failed” means that the sender domain has wrong SPF record, or that the sender is using a spoofed mail ‘From‘ address. How to fix “550 spf check failed” error? Now, we know that SPF record check is causing the problems with mail delivery.
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