Mar 15, 2018
Email is a conundrum.
Pros: Being able to send messages, documents, images, video, and links to everything else. Virtually instantaneous all around the world. Able to message a group of friends.
Cons: SPAM, SPAM, SPAM, and anti-SPAM nets.
One of our servers has been blocked by Hotmail – so parents with hotmail email addresses won’t be getting their interview bookings via email for a week or so. I know this can be frustrating, for the parent, you and me! We get messages bouncing like (names have been changed):
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: firstname.lastname@example.org host hotmail-com.olc.protection.
outlook.com [18.104.22.168] SMTP error from remote mail server after pipelined MAIL FROM:<email@example.com> SIZE=2330: 550 5.7.1 Unfortunately, messages from [22.214.171.124] weren't sent. Please contact your Internet service provider since part of their network is on our block list (AS3140). You can also refer your provider to http://mail.live.com/mail/ troubleshooting.aspx#errors. [BY2NAM01FT037.eop-nam01.prod. protection.outlook.com]
I have sent them the appropriate message in the hope that somebody will correct the problem. However, this can take a few days or a few weeks – I have never ever heard back from them that they have reacted to one of these messages, so I don’t know exactly what happens or when.
There are of course security measures we have put in place. We implement a TLS certificate that verifies our identity. We also implement an SPF record to verify ourselves to other mail systems. Clearly hotmail are ignoring these efforts.