Rated 4 out of 5 stars

Add-on "SMTP control" provides an autoselect feature.

This review is for a previous version of the add-on (1.1.0). 

Rated 4 out of 5 stars

I concur to the suggestion to auto select the available SMTP server. I reckon this could be based on learning (or asking the user to provide) associations between current IP domain and valid smtp server (no, ping won't work).
Pierre

This review is for a previous version of the add-on (1.1.0).