>>>>> "CK" == Christian Kurz <shortygetuid.de> writes:

>> > > directly send out the mail. If that fails, because the MX doesn't want
>> > > to accept mail from a dialup host, postfix should use a relay_host.
>> >

>> fallback_relay = smtp:[your.fallback.relayhost]

CK> Well, I use the newest available snapshot here, so this should be no
CK> problem for me. Thanks for your quick answer and thanks to Daniel and
CK> Ralf also, who answered very fast.

Well, if you're looking to fallback after a 5xx error which is what
you'll get from someone using the DUL, then you won't be satisfied
with this. The fallback_relay *only* does fallback to the other host
in these two cases: "a message destination is not found, or if a
destination is unreachable" (to quote the sample-smtp.cf file).

I'd like to have a tweak to this so that any deferred message also
gets sent to the fallback relay host. For example, for timeouts and
such.

If you're worried about being blocked via DUL, then you need to use a
relay_host, not a fallback_relay host.

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Vivek Khera, Ph.D.                Khera Communications, Inc.
Internet: kherakciLink.com       Rockville, MD       +1-240-453-8497
AIM: vivekkhera Y!: vivek_khera   http://www.khera.org/~vivek/

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