SMTP error from remote mail server after pipelined MAIL 550 5.7.1 Unfortunately

Muneef

Member
Nov 4, 2020
22
2
3
Sri Lanka
cPanel Access Level
Root Administrator
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
host live-com.olc.protection.outlook.com [xxxxx]
SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=13783:
550 5.7.1 Unfortunately, messages from [xxxxx] 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. [HE1EUR02FT014.eop-EUR02.prod.protection.outlook.com]


Attachment blocked - file type not allowed.

Attachment blocked - file type not allowed.
 
Last edited by a moderator:

ZenHostingTravis

Well-Known Member
PartnerNOC
May 22, 2020
184
58
28
Australia
cPanel Access Level
Root Administrator
Hi @Muneef,

Unfortunately the IP address of the server you are using has been blacklisted by Outlook and that is why email is bouncing.

You should contact your service provider if it's a shared server that your website resides on.

If it's not a shared server, you should investigate why an IP has been blacklisted. You can be blacklisted if a website, for example, relays spam. You can go to the following link to request your IP be removed from the blacklist: Delist IP - Delist IP It might be worthwhile looking into using a SMTP relay such as SMTP2GO.

Hope that helps!
 

cPanelAaronH

Well-Known Member
Staff member
Dec 31, 2014
70
19
133
Houston Texas
cPanel Access Level
Root Administrator
Thanks for helping out @ZenHostingTravis

"Please contact your Internet service provider since part of their network is on our block list (S3140)." does provide this information. You may be able to request a different IP, but you can likely work with your host to have the IP delisted.


May provide some additional information on the IP address as well.
 

Muneef

Member
Nov 4, 2020
22
2
3
Sri Lanka
cPanel Access Level
Root Administrator
Router:dkim_lookuphost
Transport:dkim_remote_smtp
Out Time:Dec 1, 2020, 3:37:03 AM
ID:1kk3yK-00058A-Ri
Delivery Host:live-com.olc.protection.outlook.com
Delivery IP:XXXXXXXXX
Size:44.33 KB
Result:SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=47269: 550 5.7.1 Unfortunately, messages from [XXXXXX] 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 Troubleshooting. [BN8NAM12FT054.eop-nam12.prod.protection.outlook.com]
 

cPRex

Jurassic Moderator
Staff member
Oct 19, 2014
2,067
283
213
cPanel Access Level
Root Administrator
Thanks for those details. That indicates the IP address you are trying to send mail from is being blocked by Microsoft. You'll want to ensure your server isn't being used to send spam messages, and then work with your hosting provider to get removed from Microsoft's blacklist, but you won't be able to resolve either of these issues using any cPanel tools.