IPv6 sendmail problem

Mike michael at NOMENNESCIO.NET
Fri Oct 7 15:07:07 IST 2005

> From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> Behalf Of Julian Field
> One for you gurus out there...
> I'm using IPv6 with sendmail 8.13.1 on RHEL 4 box.
> Got problems relaying. My access db contains these IPv6 lines:
> IPv6:2001:0630:00d0 RELAY
> IPv6:2001:630:d0 RELAY
> [IPv6:2001:0630:00d0] RELAY
> As you can see I have tried a few variants :-)
> But I still get these errors:
>     ----- Transcript of session follows -----
> ... while talking to relay.ecs.soton.ac.uk.:
> >>> DATA
> >>>
> <<< 550 5.7.1 <user at domain.ac.uk>... Relaying denied. IP name lookup
> failed [IPv6:2001:630:d0:f110:204:23ff:feb3:e42c]

I think the problem is that the IPv6 address
2001:630:d0:f110:204:23ff:feb3:e42c cannot be resolved into an IP name:

# host 2001:630:d0:f110:204:23ff:feb3:e42c
not found: 3(NXDOMAIN)

As opposed to:

# host 2001:630:d0:f102:230:48ff:fe11:b6bc
domain name pointer peewit.ecs.soton.ac.uk.

(relay.ecs.soton.ac.uk being an alias for peewit).

I presume that the relay entries in your access.db are therefore not
executed. On the notation, I have the following entry in my access.db:

Connect:IPv6:2002:507f:a412::1	OK

So, IMHO the [] are not necessary. IPv6:2001:630:d0 RELAY should be ok.

> It appears to be ignoring my IPv6 RELAY lines altogether.
> Any ideas?
> - --
> Julian Field


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