Hotmail ignoring MX records
by Andrew Macpherson on Sep.02, 2011, under E-Mail hosting, Operations
One of my customers reported a very focused failure.
They could not receive emails from Hotmail. Everywhere else seems to be fine, just hotmail returned immediate failure when mail was sent to them. The same hotmail account could send mail to us, and to other customers.
The thing that was different with this customer was an A record for their domain, a practice I try to discourage, because I could see this happening with mails from out of date systems, but as far as I was aware, not an issue with major providers. The customer has the domain-level A record because their website supplier thinks it uncool to use www. in front of the website (a mistake made by WordPress-mu as well)
It was very simple to demonstrate the fault. We removed the domain level A record from the DNS and the mail immediately started to come through.
