One more thing... On 9 Feb 2018, at 9:09, Motty Cruz wrote:
Isn't because my smtp server does not support TLS?
Yes, it could be. Their broken firewall may be set to require TLS support.
Which is not in itself a bad thing. The only thing broken about this IF it's because they require TLS is the way they are disconnecting.
Not supporting TLS for incoming email is not a rational choice in the modern world.
