I’m seeing this error from Hotmail/Outlook when sending an email:
Please contact your Internet service provider since part of their network is on our block list
I’m sure many of you have seen this error when sending email to Hotmail/Outlook:
Unfortunately, messages from [IPHERE] weren’t sent. Please contact your Internet service provider since part of their network is on our block list
Typically this has meant that your IP space is not clean, and that Microsoft has blocked it from emailing their service. At least, that has been the prevailing thought, that they would be honest with this messaging. It seems that this is no longer true. I have been able to confirm that Microsoft will return this error when blocking content or sender, under unknown conditions. I’ll show my work:
From my relay:
Mar 27 14:45:10 relay-direct3 postfix/smtp[22758]: 3AFE73F04C: to=<{removed}>, relay=hotmail-com.olc.protection.outlook.com[104.47.13.33]:25, delay=0.21, delays=0.04/0/0.13/0.03, dsn=5.7.1, status=bounced (host hotmail-com.olc.protection.outlook.com[104.47.13.33] said: 550 5.7.1 Unfortunately, messages from [185.234.75.10] weren’t sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [HE1EUR04FT016.eop-eur04.prod.protection.outlook.com] (in reply to MAIL FROM command))
From the same relay one second later:
Mar 27 14:45:11 relay-direct3 postfix/smtp[22751]: C1B503F04C: to=<{removed}>, relay=grewada-nl.mail.protection.outlook.com[104.47.4.36]:25, delay=1.1, delays=0/0/0.48/0.66, dsn=2.6.0, status=sent (250 2.6.0 <{id removed}> [InternalId=2035814505849, Hostname=VI1PR10MB1901.EURPRD10.PROD.OUTLOOK.COM] 15682 bytes in 0.153, 99.524 KB/sec Queued mail for delivery)
From their support team just a few hours later:
We were unable to identify anything on our side that would prevent your mail from reaching Outlook.com customers.
So you see, it is now true that Microsoft returns errors that are misleading and false, and this is as close to their own admission as we’ll probably ever get.
They really seem to be the worse at it. Yesterday Mailgin was having problems with them. Well my shared IP did.
This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.