Tuc at T-B-O-H.NET wrote: > Everyone keeps telling me to push the userlist out to the > MX. This isn't possible, since everything is handled in virtusertable. > So then they tell me to push the virtusertable out to the MX's.
You are begining to understand why MX relays are recommended against. They don't really serve a good purpose today. They do cause hard problems to solve. If you do need one then you also need to solve the hard problems that it pulls in too. Mail transfer agents can retry mail delivery. They don't need to deliver it if your main mail server is offline. They can wait and send it later when it is online. > So I've asked multiple people multiple times how using sendmail > on an MX thats not a final delivery server how to use the virtusertable Did you ask that on the sendmail users mailing list? That would be the place. I couldn't recommend using Sendmail anymore. I recommend Postfix generally but Exim is also a fine MTA. > I think the issue most people are having is that they > have the luxury that every MX in their list is a final delivery > host. We don't. MX's for us fall under the heading of "If the > sole final delivery host is too overburdened, or is down > for maintenance, hold the mail atleast until it comes back". These days many people think that is not a worthwhile reason to have a backup MX. (I am one of those people.) Because of this it isn't solved by anyone because no one wants to work on it. It is your server and it is okay for you to want to do this. But since you are going against the current best practices it means that fewer people care about solving that problem. Which means that you would need to do it yourself. But if you do a nice solution to the problem then other people who think like you do will be greatful for your efforts. If it is really a very nice solution then it might even fall back into favor as an okay way to do things. > That REALLY REALLY worked well for us when the datacenter we > were at in NYC went down during 9/11 because the National > Guard stopped a fuel delivery truck for an hour. Our MX > was uptown. When we finally came back online. What would have been the downside of *not* having a backup MX? The mail would have remained in the mailqueue. Comcast, AOL, Yahoo, Gmail, corporate servers, private servers, etc. would have retried to send the mail to you later. When your main mail relay came online they would have retried and delivered it. There would have been NO DIFFERENCE at all. You didn't need your backup MX relay to proxy relay the mail to you. Bob
