I've literally spent months trying to find something that allows to only customise e-mails sent via any action of my wordpress site (ie. registration, password related e-mails, post/comment notifications, etc...). I'm aware of and have used one of the more notorious ones - Theme My Login - however, I'm currently using Mingle since it's a community based site but it doesn't seem to have an option for e-mails.
I'm dubious about using both Mingle & TML together especially after I was unable to login using the TML login page and widget. And as yet haven't found a plugin that will allow complete customisation of all e-mails (not just the technical stuff such as which host or port to use - WP Mail SMTP for example - but also the content of the e-mail).
There are many plugins that provide this functionality, however they also change other settings that could mess with what I've already got in place, so far none do just this one thing. Short of a core hack which involves too much time and work to keep updated, I did come across WP Mail Options, which seems to contain a "Body" field, but there's no real information on what this is for. Will it do what I need or does anyone know of one that will?
Thanks in advance,