git log --pretty=format:"%an" | sort -u
Conflicts: src/postal/message.clj test/postal/test/message.clj
JavaMail turns on authentication in the `connect()` arity when user/pass are not null. This isn't compatible with some SMTP servers, and it's a bug anyway for postal to coerce nil to a string here. Closes #31.
Usually the java.io.File's name is good enough, but if you're using a tempfile, more control over the filename is useful. And the Content-Description header can also be helpful to have.