fix unmatched quote, and allow for from address, etc. config

[nachbar]

There was a mismatched single quote as a result of the recent (June) patch, which prevented monit from connecting to my smtp server. monit also complains if the port is quoted.

Also, my smtp server wanted the "from" email address to be set. Thus, this commit addresses those two issues.

Thanks!

[nachbar]

I didn't see the other pull request by japaternoster before submitting this one. That pull request also fixes the mismatched quote and removes the quoting from the port.

The quoting of the hostname is permissive, so it can be left or removed at your discretion.

[andreiglingeanu]

Sorry, I just added one more pull request that fixes this issue.