Sending Mail from an alias has "_blank" in from field
I am on Zimbra 6.
I have configured external IMAP account in my users' mail. When ever they send mail using external account alias, it appears as from "_blank" in recipient's inbox instead that alias name/address
Although in Account's configuration the field
"From: Choose the name that appears in the "From" field of email messages" has been properly configured with required name and address.
Can someone please guide me where to look at.