On 9 Feb 2018, at 9:09, Motty Cruz wrote:

Hello Bastian,

you're right "

( on the
customer side this is the bounced message "Remote Server returned '<
spring1.mydomain.com #5.0.0 smtp; 554 Security violation. Email Session
ID:" )

This is a message generated by a dysfunctional and misguided option in a firewall. The sender is having their SMTP session hijacked by that firewall and mishandled because the firewall manufacturer doesn't understand SMTP adequately to function without breaking connections carelessly and for no good reason.

Isn't because my smtp server does not support TLS?  or do you have any idea how to solve this problem?
is driving me to the cliff.

The sender needs to fix their firewall.

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