Hi Robert,
> Now upon start-up:
>
> 2016-04-21 20:01:04 Warning: No server certificate defined; TLS connections will fail.
> Suggested action: either install a certificate or change tls_advertise_hosts option
>
> Which is fine… But adding something like "tls_advertise_hosts = !*” to config doesn’t squelch the warning.
the parameter is usually used to define the domains for which TLS should
be advertised. If you don't want to advertise TLS to any client
you only have to add the following entry to the main section of the
Exim configuration: