I think there is a big Bug in GW2014R2.

If I change to a user where I have proxyaccess to, and write an email to a mailergroup from my own addressbook (like shown in the addressbook) , the mail goes to the "sendItems" folder, but there are no recipients in the mail. So nothing will be sent !

I have a lot of users who use proxyaccess to other accounts and sent a lot of mails to mailergroups. No one of this mails are sent since we've updated to 2014R2 !

Any ideas how to solve this problem fast without downgrading the clients again ?

Or is there any other release version of the client where this bug is fixed ?