I facing this problem...every time a user tries to send an e-mail to a group mail, the mail is not sent and the system replies with this message: mail.SEND_FAILURE.
(please refer to the picture attached)
WHAT could be causing this problem??? HOW to solve it??? :(
I assume this question isn't about Zimbra Development (which is where you've posted)? I'll move to to the correct forum
A forums search will usually find the answer, see if this relates to your problem.
Originally Posted by untnine