`message.addHeader` function not backwards compatible about postmark-java

[RupW]

Which version used to work? I've tried this with 1.1.7 and I see this behaviour too.

The problem is the space in your header name, which isn't allowed in header field names

A field name MUST be composed of printable US-ASCII characters (i.e., characters that have values between 33 and 126, inclusive), except colon.

so mail clients assume it isn't a header and treat it as the start of the mail body. Hence what you're seeing. Try something like

message.addHeader("X-Powered-By", "Bookmemate");

instead.

The only thing I can guess that might have changed in the library would be if custom headers used to go at the end of the default headers, so mail clients already thought they were processing headers not body and you got away with the space. But as I said even the very old version I'm using puts custom headers first, so I'm not sure that's it.

[dittmarconsulting]

Sorry for the late reply.

That message.addHeader("Powered-by", "Bookmemate"); actually worked.

Thank you so much @RupW

PS: I will close this ticket but it would be great if you can update the docs and let others know, although it's been known that, for instance HTTP header don't allow spaces either.