Starting a couple of days ago my zimbra server began reporting the following error (via the web client) when attempting to send mail:
msg - SMTP server reported: Invalid Addresses
code - mail.SEND_FAILURE
method - ZMCsfeCommand.prototype.invoke
detail - soap:Sender
data - [object Object]
On the surface it'd appear that the address the mail was going to was invalid. If I try to send again (sometimes a couple of retries are necessary) the message will be delivered just fine. Anyone have any ideas as to what would cause this?