Looking to see if you can quickly help me find a resolution to my Exchange issue. Today, inbound mail to our domain name fails with "550 MTA inaccessible for too long"
Internal mail is fine, and sending outbound mail is fine.
Anyway, after initial troubleshooting using MXTOOLBOX and simple TELNET, I see that I cannot connect via port 25.
Any hints on where to begin?
I'm looking on a Sonicwall and this looks fine - Exchange service itself looks fine - I need some hints please.