Accept hostnames in the mail configuration.

[audetto]

HI,

I was testing the Uthernet II emulation in AppleWin and configured the pop and smtp with hostnames. Only after a bit of debugging, I realised it was trying to connect to 0.0.0.0, rather than returning an error.

I dont know how hard it is to accept hostnames or inform the user about it.

[bobbimanners]

Would probably be fairly easy to detect it falling back to 0.0.0.0. Doing a DNS lookup would be more work. I will look into this sooner or later :)