* Chris Hills:
On the topic of mail rejection I have come across a few sites that reject mail, even to postmaster@, from domains that have one or more ipv6-only MX records listed (i.e. a domain name with AAAA but no A record(s)). The common factor seems to be mimedefang.
Plain sendmail has got a similar issue, especially if the best MX is IPv6-only. I learnt that the hard way---and it speaks for the quality of IPv6 testing that the "IPv6 considerations for SMTP" RFC (forgot its number) doesn't even come close to mentioning this issue, preferring to talk about bizarre reachability concerns. 8-P -- Florian Weimer <fweimer@bfk.de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99