Before you post
✅

Is your feature request related to a problem? Please describe.
I am currently trying to connect WACS to my on-premise Exchange server using the Mailkit e-mail notifications, but have trouble properly configuring it.
Sadly, all I can see in verbose mode is this:

2023-05-23 09:00:57.850 +02:00 [INF] Sending test message...
2023-05-23 09:00:58.259 +02:00 [ERR] Problem sending e-mail
MailKit.Security.AuthenticationException: 451: 4.7.0 Temporary server error. Please try again later. PRX4
 ---> MailKit.Net.Smtp.SmtpCommandException: 4.7.0 Temporary server error. Please try again later. PRX4
   --- End of inner exception stack trace ---
   at MailKit.Net.Smtp.SmtpClient.AuthenticateAsync(Encoding, ICredentials, CancellationToken )
   at PKISharp.WACS.Clients.EmailClient.Send(String subject, String content, MessagePriority priority)

Describe the solution you'd like
Mailkit provides a ProtocolLogger object as described here that could be enabled with the --verbose flag. The piece of code that would need to be changed for this is Line 77 in EmailClient.cs.

Describe alternatives you've considered
❌

Additional context
The Mailkit error I provided happens when using port 578 and setting SmtpSecureMode to 3. Port 578 corresponds to a FrontEndTransport receive-connector on the Exchange server. Interestingly, using port 465 which corresponds to a HubTransport receive-connector works, but would require portforwarding a backend port. What the error "PRX4" actually means is still unclear.