Good Morning everyone.
So I just noticed big queue in my mails to external servers. After fast investigate I noticed blocked port 25 here:
Fast call to my ISP and just got straight answer that my ISP block this port for security reason since last night.
So I started to looking for a solution - eg. change port to 587 and found some articles about that. In fact my mail server had used port 25 to send mail outside. I use command:
Get-SendConnector | fl port
with bring: "Port : 25".
So my next step was change it to 587:
Set-SendConnector "My.Domain.Name" -Port 587
Unfortunately I have still issue to send mail outside my exchange server. I receive that type of errors here:
2021-10-26T12:19:04.508Z,MyDomain.Name,08D9987A111B2A02,2,,18.104.22.168:587,*,,"Failed to connect. Winsock error code: 10060, Win32 error code: 10060, Destination domain: gmail.com, Error Message: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 22.214.171.124:587."
I rebooted server twice, also, flushed DNS cache.