Just his week my emails are suddenly being mysteriously delayed and then not delivered. I don't know what is going on. This server has been sending emails reliable for many years. It is an Exchange 2003 server running on SBS2003. I checked to see if my server is blacklisted, and it does not appear to be. It has cause some undo stress for my business not having emails delivered in a timely manner.
Any Ideas? email server is home.888phantom.com IP address is static 18.104.22.168.
The only change that was recently made is an increase in DSL line speed from 3 mb to 5 mb.