Exchange 2103
Server 2012R@ Std (Hyper-V)
ISP Comcast Business
GoDaddy for Domain management & certificates
I am getting inbound mall being rejected from external senders with:
Remote Server returned '<[remote.longsoho.com] #5.7.1 smtp; 530 5.7.1 Client was not authenticated>'
If I send a message on the internal network via exchange, it goes through.
It was working fine for years but I had to change out my small business Cisco router (old one died).
Here is what I have verified:
Mail certificate from GoDaddy is current
Exchange says GoDaddy certificate installed
Router port forwarding of Comcast ports; 143,987,995 & 987 forwarded to exchange server
Port 25 & 110 forwarded to exchange server
What am I missing so I can get external email flowing in?
John Lenz