However, it does NOT handle HTML email very well at all, it's attempts at stripping HTML code out to present a plain text email are so bad the end results are unreadable.
In this day and age it is impossible to insure all email is in plain text.
Thanks for providing this feedback!
HTML support is definitely something that will be added in the future - you are totally right that it is essential.
Just to explain the current processing of the mails: Mailster only tries to work with the HTML when there is no plain text version included in the HTML mail (which the majority of mail clients does).