[snip]

> If one finds oneself stuck with an rdns-less IP, there's an unhappy

This my opinion, and my opinion alone after being in this exact situation.
ANY ISP who does not exert the small effort to setup reverse DNS for their
IP blocks either deserver daily phone calls until it is fixed, or is not
worth giving your money to.

> workaround of relaying through the ISP's designated relay server. Your
> inbound mail will still work because the MX will still point to an A
> record that points to your IP address, and I've never heard
> of any mail
> server that refuses to deliver to based on a lack of rdns.

Deliver to meaning refuses to accept incoming mail because the client has no
rdns entry?

freebsd.org.
This is how I discovered my new DSL connections IP block as
reverse-dns-less.
All mail to it was bounced with the appropriate error (They run Postfix I
believe).
It took a week of complaining to SBC before it got acknowledged ("Reboot
router router. Pfft") let alone fixed.>

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