Support for smtp vs smtps

[SanjulaGanepola]

After the change made in #126 to go from smtp to smtps, I noticed that we can no longer use a server such as na.relay.ibm.com. This is because of the port that it ends up using:

• smtp -> 25
• smtps -> 465

Option 1: Support both smtp and smtp as a destination <id>.
Option 2: Support only smtp as the <id> and add an optional field for the port where the default is 25.

@ThePrez @jonnyz32 What are your thoughts on this?

I think option 2 is probably better since users can set whatever SMTP port they want based on what they have configured as it looks like there are even a few more typical SMTP ports:

[ThePrez]

Thanks for catching, Sanjula!

I think we need to do Option 1, simply because it's hypothetically possible to host smtp on 465 and smtps on 25, etc.
From a code perspective, it's a matter of just duplicating the logic for smtp and smtps and allowing for port configuration (I think that's already done)