Re: Undelivered Mail Returned to Sender when trying to register with Hotmail account

Posted by François Van Lerberghe on
URL: https://support.nabble.com/Undelivered-Mail-Returned-to-Sender-when-trying-to-register-with-Hotmail-account-tp7608516p7608618.html

Hello Israel,

Thank you for your answer.
As I can see in the error return post, joined in my first post, it's not a bug in Nabble, it's a blacklisting of Nabble dns (162.255.23.22).

"<[e-mail]>: host
   hotmail-com.olc.protection.outlook.com[104.47.126.33] said: 550 5.7.1
   Unfortunately, messages from [162.255.23.22] weren't sent. Please contact
   your Internet service provider since part of their network is on our block
   list (S3140). You can also refer your provider to
   http://mail.live.com/mail/troubleshooting.aspx#errors.
   [PU1APC01FT044.eop-APC01.prod.protection.outlook.com] (in reply to MAIL
   FROM command)
Reporting-MTA: dns; n3.nabble.com"

It seems to me that the dns "n3.nabble.com" is in a block list at Hotmail/Outlook. If I'm right, you must fix it between Hotmail/Outlook/Microsoft and Nabble.

Many customers had this problem. See this thread :
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-oattach/hotmailoutlook-block-list-s3140-blocks-all-new/699f3a56-406e-4804-97e2-cbe23b9bb01c?page=1

You will find good explanations for fix the problem
- at the end of page 4 of the thread
- at https://blog.paranoidpenguin.net/2020/08/outlook-com-is-no-longer-blocking-my-mail-server/

But only Nabble can do that, not me !
It would be nice if you could do something for me about this problem.

François