> -----Original Message----- > From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On > Behalf Of Barry Brimer > Sent: Wednesday, June 29, 2005 9:47 AM > To: centos at centos.org > Subject: [CentOS] Postfix / Postini question > > > > I have a mail server that handles several domains. One of these domains > has > decided to use Postini. For those not familiar with Postini, you set your > MX > records to use their mail servers. They filter mail, and deliver you only > the > clean virus/spam free mail. The idea is to only allow incoming mail from > their > mail servers so spammers are unable to send to your mail server directly. > This > is fairly simple to do with standard restriction classes for a dedicated > mail > server. I am not sure how to accomplish this on a shared mail server. > Ideally > I would like to instruct postfix to accept mail from anywhere for all > domains > except one domain (the one using Postini) and only allow mail destined for > that > specific domain to originate from Postini's mail servers. Any ideas would > be > greatly appreciated. I'm not a postfix guru but I don't believe that is possible with a shared server. However, it's been my experience that if your server is not listed as an MX (and it won't), MXs exist (and they will -- Postini's) then mail will not be delivered to your machine by anyone except Postini. The only two scenarios I am aware of in which mail would get delivered to your server instead of Postini's would be if a) you were listed as a fallback MX or b) no MX's were specified then the A record for your domain would be used. Have you looked through the postfix wiki, documentation, faq, mailing list, etc? That'd be the first place I'd go since they _are_ the postfix experts ;). -- Marc