Easyform always in spam(?)

Plone Support
1

I have a few sites where I switch the default contact form to a new Easyform, usually with just another field or two.
Every time, the mail end up in the spam folder after the switch. (then I have to instruct the users on how to modify there spam filter).
Any suggestions on why this happens (the sender, the subject etc are all the same)

2

Is there any information in the header of the received email why it was filtered?

3

I can not really see any difference, except that the subject is now:

Subject: =?utf-8?q?Subject?=

It should probably be
Subject=Subject

4

This is just an valid encoding thing, see RFC 2047 RFC 2047 - MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text (there are also examples in section 8). I don't think it will influence any spam filter.

5

Best you take both raw message before sendout (Products.PrintingMailHost is your friend) and diff them?