Extract method
Extract method
Inline method
Extract class
Use OutgoingDelivery instead of OutgoingEmail
Set sender when dkim is disabled. Fixes #166
Use from information from contents of the mail
Handle setting sender with dkim
Small refactor
Extract into options
dkim filter has no knowledge of delivery
Small refactor
More isolated test on dkim filter
Inline css filter doesn't need any options
Pass version to filter for adding x-mailer header
Test for mailer header more isolated