Some of our users are frequently getting the following error in zimbra web client:
msg - SMTP server reported: 450 <firstname.lastname@example.org>: Recipient
address rejected: unverified address: Address verification in progress
This happens when users are sending email through the web client. What is the cause of this issue and how do I resolve this.
I am on zcs-Network-4.5.6 /SLES 9