The UID EXPUNGE command requires the UIDPLUS extension.
The UID EXPUNGE command requires the UIDPLUS extension.

Fixes issue #70

matt2003/MailKit,FubarDevelopment/MailKit,sstraus/MailKit,rajeshwarn/MailKit,eino-makitalo/MailKit,jamie-dainton/MailKit,mganss/MailKit,dsbenghe/MailKit,jstedfast/MailKit,nachocove/MailKit