Multiple PTR records

[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), have one IPv4 address, 
and few IPv6 addresses. The IPv4 address configured on the router, 
DNAT-ing the TCPv4 ports to one of the computers (80 -> comp1, 25 -> 
comp2, etc). IPv6 is natively routed.

I don't want to break forward <-> reverse mapping.

So the config would be something like this:

example.com. MX 10 mail.example.com.
www.example.com. A 1.2.3.4
mail.example.com. A 1.2.3.4
www.example.com. AAAA 2001::1234:1
mail.example.com. AAAA 2001::1234:2
1.0.0.0.4.3.2.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.2.ip6.arpa. 
PTR www.example.com.
2.0.0.0.4.3.2.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.2.ip6.arpa. 
PTR mail.example.com.
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? Or anyone else have a better tip how 
could i handle this situation? Multiple PTRs in this case is really an 
issue?

The main thing i don't want to break forward <-> reverse symmetry cause 
there are some sanity checks about this (like in spamfiltering).

Thank you.