[Cialug] PTR records & SPF?

[Zachary Kotlarek]

On Oct 12, 2010, at 2:35 PM, L. V. Lammert wrote:

> Does anyone have a definitive source on how/whether it is possible for
> multiple mail servers to share the same PTR record (i.e. the PTR name does
> not match the server helo)?



http://www.openspf.org/SPF_Record_Syntax

The "ptr" mechanism
The hostname or hostnames for the client IP are looked up using PTR queries. The hostnames are then validated: at least one of the A records for a PTR hostname must match the original client IP. Invalid hostnames are discarded. If a valid hostname ends in domain, this mechanism matches.

	Zach

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 2746 bytes
Desc: not available
Url : http://cialug.org/pipermail/cialug/attachments/20101012/101354c4/attachment.bin