I'm having a problem with our new Exchange 2010 server. Everything is working fantastically, except for clients (smart phones and email software) that must use SMTP for outgoing mail.
For example, one users phone won't connect via SMTP. I have the Client Receive Connector setup to use port 587 with TLS encryption but the phone says the server does not support it.
I can't get Outlook or Thunderbird to connect either. I'm at a loss as to what my next step is.
Any further information that's needed from me?