Honestly, the only thing I like from this is the tracker blocking and no automatic footers/signatures. But how well do they support plain-text only emails? I'v

Honestly, the only thing I like from this is the tracker blocking and no automatic footers/signatures. But how well do they support plain-text only emails? I've been moving more and more to plain-text as my default setting for sending emails and it's pretty liberating. I'm also starting to read emails as plain-text first before switching to an HTML content-type, but that's more painful.