Mikael Bak wrote:
Is it really recommended to run a mail server that accepts email from outside with non static IP address? I would not do it.
As long as the dynamic DNS service works well, and the IP address only changes very rarely, why not?
I've been doing this for close to a decade now, while staying subscribed to dozens of mailing lists like this one (email traffic probably in the 100s / day). The dynamic DNS provider gives me a very low TTL (10 sec), responds in an instant to IP changes signaled from my side, and otherwise works without a hitch.
My IP address is technically dynamic, but in reality it almost never changes, which helps, I guess.
I've even switched Internet providers several times and had no problems. The mail queues up upstream while I'm briefly offline, then starts pouring in after the switch.
The only tricky part is to setup the dhcp client to run the DNS update script triggered by any IP change. You have to test it carefully, maybe tweak some delays in it, stuff like that. Delicate, but not rocket science.
Postfix itself is rock solid as ever. I'm grateful for having one less service to worry about, security- and other-wise.
-- Florin Andrei http://florin.myip.org/
