Getting around ISP SMTP firewall settings (Re: Submitting a new port if send-pr is broken)

Bob Richards rrichard at
Mon Nov 26 04:01:50 PST 2007

On Mon, 26 Nov 2007 13:15:59 +0200
Giorgos Keramidas <keramida at> wrote:

> I don't think there's an easy way to set up the local Sendmail
> installation to *receive* email from the world without some sort of
> `static address' though. 

Actually there is an easy way, I do it here at my work station which is
on a boat, and uses many different modes of connectivity. All of which
are floating IPs.

Get a domain name at dyndns. (it's free) 

You can also DNS any domain you own for about $29.00/Year, and simply
MX your mail to your dynamic domain machine on a variety of alternative

Install ddclient on your machine; it will keep your IP updated at

Install an mta, like sendmail, and smart-host it to your ISP; or
smart-host it to dyndns if your ISP can't/won't do it.

I have been doing this for about 2 years now, and have had no problems
at all.


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