5.0.6

Bugfix

• Email addresses with a stray space around them are no longer thrown away, so a from, to, cc, bcc or reply_to setting that ends in a space keeps working instead of failing with a confusing "An email must have a From or a Sender header" error.
• An address setting containing nothing but spaces now tells you that address needs configuring, rather than failing later with that same confusing error.