mailserver.html: Testmail ajax request was not url encoded
mailserver.html: Testmail ajax request was not url encoded

Plus symbol in mail addresses (allowed by RFC) did not work and were sent as blank.
Changed self-build request to jQuery data structure. jQuery by default uri-encodes.

Fixes #189 - only test mails from Web-UI were affected.

mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry