[exim] unable to receive emails in plain when starttls is en…

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Autor: Peter Sutta - Mediate s.r.o.
Data:  
A: exim-users
Assumpte: [exim] unable to receive emails in plain when starttls is enabled
hello.

i`ve enabled starttls on all exim ports 25, 465, 587.
everything goes well except recieving emails from mailservers which
doesnt support tls.
i`ve tested email delivery from remote telnet client and i`ve get:

554 SMTP synchronization error
Connection closed by foreign host.

it seems like if remote host doesn`t support tls emails can`t be delivered.
if remote hosts support tls, everything works as expected and emails are
delivered.
user authentication for sending emails works as well.

i am struggling for couple of days with this.
kindly ask you for your help guys.
if you need any exim runtime configuration output, please let me know.

cheers peter.