On Tuesday 22 July 2003 12:18 am, Martin Fahrendorf wrote: > Am Montag, 21. Juli 2003 22:18 schrieb JoeHill: > > Hello, > > > > I am on a small internal LAN which does not use a Domain name or even > > have a DNS server, well, except for the router in a way I suppose. > > > > Anyway, I want to try to use my mailserver, simply called "localhost", > > to send mail out rather than my ISP's smtp server. Mainly a learning > > exercise, you know, start small and all that. > > > > I have used sendmail in the past and run into several problems wherein > > receiving domains see me as an "open relay" and bounce the mail back to > > me as potential spam. > > They don't do it weil because they see you as an open relay but because you > have a dynamic IP address and those addresses were missused for spaming. > They take the easy way and block whole known dynamic IP address ranges (It > is something like that: oh, there are drivers of rented cars who can not > drive so to be sure none of those drivers get on our roads lets block our > roads to all rented cars).
I have the same setup at home (postfix for localhost, and dynamically assigned address), and what I found out from some receiving systems/ISPs was that they were rejecting my email not because of the membership to a specific pool of addresses, but rather because of the reverse lookup, that would either fail, or be dynamically associated with broadband or dial-up domains. The moment I registered my domain, and pointed back to my IP address (which - by the way - as "dynamic" as it was advertised, I just "fixed" it on my firewall, and never had a problem ;)), all emails started flowing just fine, regardless of the pool of IPs I was part of ... so check out this alternative, also. Stef
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