BCC: copy not received correctly

Since I had to quit using Outlook Express (because it's unavailable for Win7) I've been having trouble with BCC: mailings in other program; so thought I'd try Zohomail. I sent a test mailing with two BCC: copies to two alternate email addresses that I use. These were composed using Windows Live Mail, and I used the Windows Clipboard to copy my original message as sent. (That copy was displayed correctly, as I'd composed it.) The BCC: copy received in Windows Live Mail was fine. However, the BCC: copy received in Gmail was received with most of the message simply missing, and the rest formatted incorrectly. Why is this? Is there any way of sending BCC: mial correctly in Zohomail?