[EMAIL PROTECTED] said:

>
> For email transfer and MTA's alike, putting SPF in DNS to help
> "authenticate" the source is a step in the right direction.  If SPF is a
> good idea, and it is dns based, then so should forward-and-back lookups.
> If additional mail standardization can take place (again) then spam can be
> reduced to a certain degree.  I much like Brian Read's idea of blocking
> mail xfer from sites which are not authenticated (SASL) or who cannot give
> a proper reverse lookup.  Every ISP we have worked with have been happy to
> create or change a PTR entry in their dns, even if it took a lot of work
> to get the ISP to do so (I even offered to do it for one isp and they
> finally did it themself).
>
> If we can standardize the set of rules and protocols required for an MTA
> to accept an email, then spam will reduce.  Either that or we need to
> build a better mousetrap. This is jut my $0.02.
>
> Your thoughts?
>
> -Eric

How would you handle the PTR record for an SMTP server that hosts 500
virtual domains?

dp

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