I have several problems with the Email plugin:
If I leave blank the "server" parameter, the application will closed after calling of ssCore.EMail.send. ( Only in the 3.5)
Setting the "charset" parameter to "utf-8" doesn't work. I have lost data. I think the same with Unicode (UTF-16).
Even if I don't use the "attachments" parameter or leave it blank, the letter comes as "has attachments". And with this "Content-Type" header: multipart/mixed; boundary="----=_NextPart_001_002_003_004"