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Please check the smtp ports they may be blocked at firewall/network level. Simple way to verify it, is telnet to smtp server,
telnet smtp.domain.com <port#>
Tried the above command but it shows blank screen
Please share the screenshot of the blank screen you are getting.
Hello @KN_9954684
Are you using the following configuration on mail thing?
PLease share some screenshots to help us understand it more.
Thanks
Om Dukiya