Just two days ago (August 11, 2016) my Windows Live Mail Version 12 was updated to build 16.4.3528.0331. Since then every message I sent to more than one e-mail address under BCC is not delivered and I get a non-delivery message saying:

"Delivery has failed to these recipients or groups:

;
The format of the email address isn't correct. A correct address looks like this: *** Email address is removed for privacy ***. Please check the recipient's email address and try to resend the message."

There is no extra ";" in the string of e-mail addresses I put under BCC, so there is no reason for this non-delivery message. I had no such problem before this upgrade.

A smaller problem is that now, after I type the first e-mail address in the BCC area, the cursor moves automatically to the "To" field, so I have to move the cursor to the BCC area, to continue to add e-mail addresses there, but then immediately after I type the next address the cursor jumps back to the "To" field. Very annoying. I had no such issue with the previous version of WLM.

Can anybody help? Thank you.