ETRN + Dynamic IP address

[Sandip Bhattacharya <sandipb@xxxxxxxxxxx>]

Hi!
I have a queer question here.

I have an online sendmail server which is handling several servers. I want to
fetch mails for a single domain through ETRN. Now I have a dialup, from where
I want to send periodic authenticated ETRN requests using fetchmail to
trigger the mailserver  into sending mails to our local server.

Now the problem is that since we have a dynamic IP, we can't put the address
in our DNS MX address. 

Any ideas from people who have used this setup??

- Sandip

--
Sandip Bhattacharya
sandipb @ bigfoot.com
http://www.sandipb.net

----------------------------