Dave, Dominic, W B Hacker >> I am assuming that; >> * You're working on the mail server for aeroclub-beta.com.au. >> * You are working on the machine with IP 203.132.28.33 >> * You want to send e-mail from [email protected] >> * Such e-mail is being rejected by some recipient hosts >> Is this correct?
Yes that's the issue. Thanks for your help. Yes the server does not have PTR or MX entry yet. I am organising that. So hopefully it will be sorted out in the next couple of days. Thanks for your help. Cheers sam_w On Tue, Mar 29, 2011 at 4:47 AM, W B Hacker <[email protected]> wrote: > Dominic Benson wrote: >> >> On 28/03/11 17:31, Dave Evans wrote: >>> >>> On Mon, Mar 28, 2011 at 05:40:49PM +1100, Sam Walters wrote: >>>> >>>> Hi Dave >>>> >>>> Thanks for the background info on how to post on this email list. >>>> I didn't notice the http://wiki.exim.org/DontObfuscate >>>> >>>> Yes you can probably get some info by looking at it directly: eg: exim >>>> -bh 203.132.28.33 *the misconfigured server in question >>> >>> I've re-read your emails a few times but I'm afraid I'm still unclear >>> as to >>> what problem we're trying to resolve here. >> >> Likewise. I'm going to take a bit of a guess at the problem; tell me if >> I'm wrong. >> >> I am assuming that; >> * You're working on the mail server for aeroclub-beta.com.au. >> * You are working on the machine with IP 203.132.28.33 >> * You want to send e-mail from [email protected] >> * Such e-mail is being rejected by some recipient hosts >> Is this correct? >> >> >> It sounds like you're falling foul of sender verification. Basically, if >> you don't accept delivery *to* an address, some users won't accept >> delivery *from* it. >> > > If that us indeed the correct sending IP, probably not a [ specific ] sender > verification issue, (they are not common) ...but rather just the basic > server 'credentials' > > There is no PTR RR showing up for IP 203.132.28.33 > > $ host 203.132.28.33 > Host 33.28.132.203.in-addr.arpa. not found: 3(NXDOMAIN) > > Absent a PTR RR, it doesn't necessarily help traffic acceptability to have > an MX RR. > > Whenever the connecting IP has no backpointer to the <domain>.<tld> the MX > or A would be published *for*, any server checking rDNS would reject > 'incoming' as a probable forgery. > > AFAIK rDNS checking is far more common than sender verification. > > Per below, an MX RR is a 'Very Good Idea' for any serious MTA as well. > > But a PTR RR OTOH, isn't just a good idea - it is pretty much *essential*. > > Needless to say, that presumes a fixed-IP, AND NOT one buried in the midst > of an otherwise-dynamic IP block, ELSE rejection can occur even if a server > is not doing rDNS checks, but IS checking dynamic-IP Remote Black Lists. Or > both... > > >> Aeroclub-beta.com.au has only an A record, resolving to 203.132.28.33. >> That is an Exim 4.69 server, (so it seems consistent with what you >> describe). That host won't accept delivery for [email protected]. >> >> If it should, then you need to configure it to. If it shouldn't, you >> need an MX record to point to the host that should. (An MX record >> wouldn't hurt in any case, A fallback isn't ideal). >> >> If it does, but info@ isn't one of those, then you should do one of: >> a) Accept mail to info >> b) Send from a different address >> c) Use a different address as the return path (the -f option, if you're >> calling from the local machine) >> d) Accept, but blackhole mail to info@ >> >> There are pros and cons to each of the above. Without more information >> as to what you're trying to accomplish, I can't say which would be most >> appropriate. >> >> > > I suggest getting both a PTR RR and an MX RR into your connectivity provider > | IP blockholder DNS. > > > HTH, > > Bill > > -- > ## List details at http://lists.exim.org/mailman/listinfo/exim-users > ## Exim details at http://www.exim.org/ > ## Please use the Wiki with this list - http://wiki.exim.org/ > -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
