I have installed wordpress and your plugin in my local ubuntu server and works perfectly like a real shared hosting website.
On programming POV, i understood that links in an email will be converted to host/address set in WordPress Settings (perhaps by calling its codex); which i believe when tracking feature is turned on. My hypothesis would be:-
“If host url is www, links in email will start with www and when the host url is localhost, links in email will start with localhost…”
However, i would like to have the capability to set a custom address because, “my localhost link is not available to outsiders and my .com link available to others”.
Instead of grabbing localhost as its address, which file should i edit so it is not going to grab the address dynamically; i would my desired .com address instead.