Re: Multiple PTR records

2009-01-16 Thread David Ford
I see it all the time on both sides of the fence. I personally support it because even though I sometimes am impacted by it, the amount of actual spam I filter out because of this is significant. >> - it's clear violation of RFC 5321 (and former 2821, 821) - server MUST NOT >> reject connection

Re: Multiple PTR records

2009-01-16 Thread sthaug
> > I have seen mail bounced because of a > > mismatch between SMTP greeting name and PTR record name. It's not as > > common as the simple "is there any PTR record" check, but it does > > happen. > > - it's clear violation of RFC 5321 (and former 2821, 821) - server MUST NOT > reject conn

Re: Multiple PTR records

2009-01-16 Thread Matus UHLAR - fantomas
> On Jan 16, 2009, at 7:13 AM, Matus UHLAR - fantomas wrote: > >Actually, it doesn't matter which PTR record will remain, unless there > >will be any SPF record pointing to it. On 16.01.09 10:12, Chris Buxton wrote: > That is a common misconception. No, it is not. > I have seen mail bounced beca

Re: Multiple PTR records

2009-01-16 Thread Chris Buxton
On Jan 16, 2009, at 7:13 AM, Matus UHLAR - fantomas wrote: Actually, it doesn't matter which PTR record will remain, unless there will be any SPF record pointing to it. That is a common misconception. I have seen mail bounced because of a mismatch between SMTP greeting name and PTR record n

Re: Multiple PTR records

2009-01-16 Thread Matus UHLAR - fantomas
> On Jan 15, 2009, at 6:33 AM, Halassy Zoltán wrote: > >I don't want to break forward <-> reverse mapping. > > > >www.example.com. A 1.2.3.4 > >mail.example.com. A 1.2.3.4 > >4.3.2.1.in-addr.arpa. PTR www.example.com. > >4.3.2.1.in-addr.arpa. PTR mail.example.com. > >Would this one break anything

Re: Multiple PTR records

2009-01-15 Thread Chris Buxton
On Jan 15, 2009, at 6:33 AM, Halassy Zoltán wrote: My configuration: Have a router, two computers behind it. comp1 has webserver (no mailserver), comp2 has mailserver (no webserver), have one IPv4 address, and few IPv6 addresses. The IPv4 address configured on the router, DNAT-ing the TCPv

Multiple PTR records

2009-01-15 Thread Halassy Zoltán
Hello! (sorry for my trash-english) I have a problem and finally i found out a "solution", but also i read the thread about multiple PTRs are not recommended. My configuration: Have a router, two computers behind it. comp1 has webserver (no mailserver), comp2 has mailserver (no webserver),