 |
 |
I would like to mention that if the mail comes directly to your mail server (mx) without forwarding, more original information is preserved that is useful for AntiSpam processing, and also you can chose to do more/less/different blacklist or greylist rejection/delaying of email. Basically, the original mail server accepting the request has the most information available regarding the mail's source, while mail servers down the line have less, and have to base their Spam decisions on the content of the mail. Aside from less accuracy at detecting Spam, some corner cases could cause the opportunity for false positives to rise. I've seen this happen. On Fri, May 02, 2008 at 09:32:10AM -0400, Jon Galbreath wrote: You understood perfectly. And it sounds like we were on the same page as far as the outcome. Perhaps I'll leave it up to the end user whether or not to designate the @isp.msu.edu address on business cards or correspondence, since that would eliminate the potential forwarding delays, despite them being rare. Thanks for the info! Jon Galbreath MCSA/MCSE/Security+ Network/Systems Administrator International Studies and Programs Ph: 517-884-2144 [log in to unmask] -----Original Message----- From: MSU Network Administrators Group [mailto:[log in to unmask]] On Behalf Of Brian Martinez Sent: Friday, May 02, 2008 9:13 AM To: [log in to unmask] Subject: Re: [MSUNAG] Mail Forwarding Jon Galbreath wrote: > > All, > > We are moving forward with our move from mail.msu.edu to an in-house > Exchange installation. During the most recent Q&A session I suggested > that we leave everyone's address as the standard @msu.edu address and > just forward it into Exchange to make it easy if you ever leave our > unit and also to keep from having to update distribution lists with > new email addresses. > > One person asked about what happens when mail.msu.edu has another > hiccup like the one that happened a couple weeks back where mail > clients and the web interface were both offline. Would mail still > forward on? > > My best recollection was that messages weren't bouncing and were just > queuing on the servers but we couldn't access them. If that were the > case, would a mail forwarder (not a filter, just a straight forward) > still pass mail on even if mail.msu.edu were down? > > Thanks for your help! > Jon, If I'm understanding what you are asking correctly the answer is, yes mail will still forward on, but only when mail.msu.edu is back up. In the situation where everything is down, the original sender's will queue up the message on their end as "Host unreachable" and their SMTP software will attempt to retry every so often (it all depends on what their config is). If mail is up and running but just being hammered down and "unreachable" to our users, chances are pretty great that we will be the ones queuing up the emails waiting to forward them on when the queue-runners get to it. To sum up, email should always (eventually, heh) be coming through. Let me know if I misunderstood. Regards, ./brm