Emails To Customers On Block List

Not sure what's happening but suddenly our emails are not getting to our customers. This is what we received just now after responding to a customer's email for our contact page:

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:

hvac777@hotmail.com
host hotmail-com.olc.protection.outlook.com [104.47.9.33]
SMTP error from remote mail server after pipelined MAIL FROM: SIZE=15318:
550 5.7.1 Unfortunately, messages from [147.135.36.186] 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. [VE1EUR03FT013.eop-EUR03.prod.protection.outlook.com]
Reporting-MTA: dns; host4.ionblade.com

Action: failed
Final-Recipient: rfc822;hvac777@hotmail.com
Status: 5.0.0
Remote-MTA: dns; hotmail-com.olc.protection.outlook.com
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [147.135.36.186] 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. [VE1EUR03FT013.eop-EUR03.prod.protection.outlook.com]

From: "staff@studio316designs.com"
Subject: Re: Contact form from your website [23679]
Date: July 21, 2018 at 9:42:39 PM EDT
To: "hvac777 at hotmail . com"


Any ideas?

Edited by

I have issues with email not getting through to Hotmail addresses too. So mum so I alwyas forward their order confirmation/link to them from my normal email account as none of them were getting the,

Edited by

Thanks Sarah:
That's a good work-a-round but it just doesn't seem like that should be happening. I'm wondering what it is about our domain/email that has it on a blocked list.

John

Edited by

You will need to contact your host. See this part of the message;

550 5.7.1 Unfortunately, messages from [147.135.36.186] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140).

Looks like the IP address of the server you are on is on their block list.

Edited Mon Jul 23, 18 5:32 AM by Tim - PicturesPro.com