> -----Original Message----- > From: Grant Griffith - IMail > [mailto:[EMAIL PROTECTED] > Sent: 22 April 2004 13:50 > To: imail > Subject: [IMail Forum] Changing Mail Server IP? > > Hello All, > > We are going to be changing our network connection to another > company and will have to change the IP Address of the mail > server. Is there a way to have multiple IP Addresses setup > for the mail server? I am wanting to make the switch over > slowly rather than having to make all the DNS changes all at one time. > > This might be easier than I am thinking it will be, but am > not rally sure. This IMail server has been running for 4 > years and I have not had to do anything major to it in that > time, so I need to refresh myself again. > > Thanks! > > Sincerely, > Grant Griffith > EI8HT LEGS Enhanced Web Management
A previous posting about multiple IPs on the mail server is correct. The rest of it is this:
You (or your ISP or registrar) should add an A record to your DNS server(s) with a different host name e.g. mail2.yourdomain.com with the new public IP address.
Then add an MX record pointing to mail2.yourdomain.com with a different priority than the "old" IP address. Incoming mail will hit the lower priority address first and then will try the next (higher priority) address if the preceding one doesn't respond.
Having these DNS settings in place for, say, 48-72 hours, is a good idea before using the new IP address exclusively, although 24 hours takes care of most Internet propagation issues.
After the changeover is complete and you de-activate the old IP completely, and if you want the old hostname back e.g. mail.yourdomain.com, you can change the A record for the original address to point to the new IP address. A couple of days later, you can remove the "mail2" A record and the "mail2" MX record from DNS.
-Paul
BTW I highly recommend ASSP (assp.sourceforge.net) for anti-spam. It's free; I have no stake in the product except that my clients are >extremely< happy with how well it works (they do pay me to help them configure it) and I'm getting the word out.
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