[nycbug-talk] Dynamic DNS MX Records

[Jonathan Vanasco]

I wouldn't trust any mail on a dynamic dns - you're apt to have  
something come in during that window that you've just switched to a  
new ip and the old ip is still out there.  all the other MTA would  
have to do is accept the message to delay (if they later bounce) or  
keep you from ever getting it (if they devnull).  either way, that's  
a big security issue.  you could set the mx as a string name to a  
dyndns server, but most mtas do caching now of a few hours -- and  
then whatever local resolver you have on that machine is apt to cache  
for a while.    also remember - chances are your MTA is the best set  
up one you'll interface with.  there are a lot of POORLY operating  
ones out there - either because they were designed regardless of RFC,  
or they were configured by an idiot.

I would either:
	a_ just use a constant dependable ip box for mail
	b_ find someone with the box above, or a service as above, and then  
use that as a 'world facing' MX that only knows the valid addresses  
-- no need to process mail.  have your local box connect to that to  
retreive all the mail for processing on your lan.  there are a lot of  
recipes for stuff like that in the exim documentation.  i'm sure  
postfix or qmail would handle that well too.

On Jan 17, 2006, at 8:38 AM, Ray Lai wrote:

> Hi Nycbuggers,
>
> I'm currently paying $60/month for Speakeasy for two static IPs.
> (Really, one is enough.) This is because I have my own web server
> and, more importantly, my own mail server.  I am looking to use
> Verizon's $14.95/month DSL, but I'm pretty sure they use dynamic
> IPs and I will need to set up dynamic DNS entries.
>
> What are people's thoughts and experiences on this?  Has anyone
> lost mail due to this setup?  Are there alternatives?
>
> -Ray-
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