My wife uses Zimbra Collaboration Suite for her work. She works from home. She has done so for over a year and has not had any problems. Today, without any known changes to the system, she can no longer receive email. She is, however, able to send email. She sent an email to my gmail account and I received it. I replied and she did not receive the reply. I did not receive in gmail any error or rejection notification. In researching the issue, I've seen a couple of postings about accessing the MTA and disabling the search for DNS function (or something akin to that). I cannot find where I would access the MTA settings (it's not under preferences, or if it is, I can't find it), and I'm reluctant to tinker with settings without knowing more. Any help would be greatly appreciated. Thanks.