On Mon, 23 Jun 2003, Adrian Golumbovici wrote: > Hi all, > > I just installed/configured/secured my own postfix server with a dyndns address. My > dyndns entry is as MX server registered and it is working. I normally have about > maximum 5 minutes offline time. My provider disconnects me each 24 hours, but linux > PC connects again immediately and updates dyndns entry, which normally takes about > maximum 5 minutes to propagate). In this time the dyndns still points to the old ip > address, which is either not connected (no user got it in so short time) or points > to someone who doesn't have the ports opened (no email server). I wondered what > happens if someone/some-server tries to deliver me email in this time. Will it be > bounced or will it retry and finally send it to me when connection available again? > > Best regards, > Adrian
Failing to connect to the old IP isn't really a concern, since (as previously mentioned) the sending server will retry. Of more concern is the fact that someone could take advantage of your situation and maliciously configure a mailserver to accept mail as your domain. If they manage to grab your most recent IP through war-dialing (of sorts) and your old IP is still cached on name servers that are being used to look-up your MX record, then they can hijack your incoming e-mail. If your e-mail means much to you I would highly suggest paying the extra $10/month for a static IP, or trying to find an ISP who provisions static IPs. -- -chort AKA Brian Keefer The thoughts I express are generally piped from /dev/random, needless to say they do not represent my fine employer: CipherTrust, Inc - www.ciphertrust.com
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