[nycbug-talk] Dynamic DNS MX Records
Tue Jan 17 19:40:32 EST 2006
On Tue, 17 Jan 2006, Jonathan wrote:
> That just reminded me-
> Many DSL/Cable providers block all traffic on port 25, unless it's being
> routed to their SMTP servers .
> They tend to consider any machine sending mail on port25 to be compromised
> and sending virus/spam , as they far more often than not are.
> I'd check to make sure they have port 25 open.
And check that it's open in BOTH directions if you're running a mail
server. I know at one point not only did VZ block outbound 25 to anything
but their own server, but they also only allowed @verizon.net From:
addresses... Brilliant. I think that went away, but you have to wonder
who dreams things like that up and who approves them for the final rollout
to all their subs.
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