[Wylug-help] email problem

[James Holden]

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On Thu, 2004-11-25 at 13:53, John Craven wrote:
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> Thanks for all your replies.
> I've checked all of them but they do not throw up any answers.
> However, I am aware that some isp require a valid reverse dns or they will reject email.
> I notice that the reverse dns lookup on this server is:
> 195.8.178.184 PTR record: mail.gvl99.co.uk. [TTL 86400s] [A=195.8.178.184] (setup by my isp)

There's nothing wrong with this. 195.8.178.184 is derived from a A
record for mail.ukzone.com. If it were a CNAME then things would be
wrong.

Likewise, 195.8.178.184 resolves to mail.gvl99.co.uk, and there's
nothing wrong with that either.

> I have another server, where mail is being accepted from the senders (all using freeserve) and the reverse dns lookup is:
> 82.68.28.33 PTR record: 82-68-28-33.dsl.in-addr.zen.co.uk. [TTL 86400s] [A=82.68.28.33] (setup by my isp)

This isn't really a reverse record as such. The in-addr is just part of
zen.co.uk's naming convention. They don't give individual names to their
DSL customers, just an arbitrary name with numbers in it.

> Is it possible that mail.gvl99.co.uk is not recognised since it does not contain in-addr ???

Nope. It's quite valid for this to be the case. A single MX could handle
mail for any number of domains.

> I am not well enough up on reverse dns lookup, but all I have read does say ..*in-addr*..
>
> Does anybody have any better knowledge about this ???

There's a whole argument around whether or not MX's should be making
decisions based on whether things have valid DNS names and reverse DNS
entries.

What I can't get here is why you're unable to *receive* mail from these
senders. Normally problems arise when they're receiving mail from you.
Again, a bounce message would really help.

James

> Thanks for all your help.
>
> John C
>
> At 19:30 24/11/2004 +0000, you wrote:
> >I'm having problems receiving some emails. All my complainants are using freeserve / wanadoo for their isp.
> >I cannot see any problems with my server. It is NOT blacklisted and it is NOT open relay.
> >Is there any way that I can check to see if any mail has arrived at my server and been rejected ???
> >
> >I am running RH 7.3 with sendmail 8.11.6
> >My mail is not checked by spamassassin and is not processed through procmailrc
> >
> >Any advice ???
> >
> >John C
> >
> >
> >
> >--
> >No virus found in this outgoing message.
> >Checked by AVG Anti-Virus.
> >Version: 7.0.290 / Virus Database: 265.4.1 - Release Date: 19/11/2004
> >
> >
> >
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> >Wylug-help at wylug.org.uk
> >http://list.wylug.org.uk/mailman/listinfo/wylug-help
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> No virus found in this outgoing message.
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