We Know All before sending anything to his mail server, he will read the database from the public server for the latest ip address of mail server and put it as destination address.. But twas a small problem, at times after fetching the latest public ip of mail server, ISP DHCP renews the IP lease of mail server, hence the message lost.
Again after some time I started thinking about a vpn connectivity from an office which doesn't have public address, so the idea of DDNS came,
Before explaining DDNS, I hope you all have a good idea about DNS, For those who dont know, DNS is the one to one mapping between name to ip address. But in DNS its will not get updated dynamically and it may take even more than 24 hrs to get updated in the root DNS servers. Here come DDNS.
