From: (no name) (no email)
Date: Tue Jun 01 2004 - 10:28:48 EDT
On Tue, 1 Jun 2004, Peter Rexar wrote:
> Hi there
>
> It becomes kinda hard to operate a mailserver hooked
> to the net via ADSL with dynamic IPs. Setting up the
> machine with Postfix and DynDNS is a piece of cake,
> but a growing number of webmail services (like Yahoo
> and GMX) are greylisting the dynamic IP ranges of
> internet providers. When they receive a mail from an
> IP out of a provider's ADSL pool, they go "hmmm, this
> must be a virus infected PC" and put the mail in the
> recipient's junk box directly. Other webmail services
> perform a reverse lookup and – as the IP resolves to a
> different domain name - they junk the mail as well.
>
> Is it therefore possible to tell Postfix to deliver
> mail to certain domains (Yahoo, GMX etc) via the
> internet providers mailserver while delivering all
> other mail to the recipients mailserver directly?
>
Yes, but better just send everything except specific peer domains to the
ISP relay. If you don't know that the domain will accept mail directly
from a DSL pool (static or dynamic) it is best to not guess.
man 5 transport
Receiving mail on a dynamic IP is also not a good idea, make sure to
implement a short TTL on your A record and hope that the next machine to
get your IP is not running an MTA...
-- Viktor. Disclaimer: off-list followups get on-list replies or get ignored. Please do not ignore the "Reply-To" header. To unsubscribe from the postfix-users list, visit http://www.postfix.org/lists.html or click the link below: <mailto:?body=unsubscribe%20postfix-users>
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