So this is something new. We've got a website with a contact form and the form was being sent to our Shaw email address at work. Today a customer contacted us because we hadn't responded to her email, we searched and couldn't find any email from her. After testing, we discovered that any emails being sent from the form were not coming through.

I contacted my hosting company because the form wasn't showing any errors, and we changed the to email address on the form and tested and it came through fine. We have several domains hosted on the same IP, and after further testing, we discovered that sending any mails from that IP (through webmail) to our work Shaw email also wouldn't come through. They're not being flagged as spam, they get sent and then just disappear.

I contacted Shaw to see if they could help me to whitelist that domain, and basically they had no idea what I was talking about. They changed a setting in the junk mail folder, but we tested and still those mails aren't coming through. There are no errors on the sending side, it's receiving them at Shaw's end that's the problem. So what the heck are we supposed to do now? I've check to see if that IP is blacklisted (it isn't) and Shaw's customer service was no help at all.