added devHost option

[hdon]

Description

Add option to override "localhost" when sending all SMTP traffic to a dummy server.

Motivation and Context

It's a simple addition and makes the testing behavior a little more flexible.

Actually though I already have an SMTP server and adding this was a cheap way to direct my email through that server.

How Has This Been Tested?

Works for me.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[GreenPioneer]

im traveling and will look at this next week

[GreenPioneer]

@hdon hey donny how did you test that it works for you ?

[hdon]

@GreenPioneer I'm actually using it to send email through our SMTP server.

[hdon]

Is there going to be any movement on this?

[GreenPioneer]

@hdon sorry i took so long on this. Got it in now thank you very much for you work