Kevin A. McGrail wrote:
I've taken a while to digest it for a more thorough response but really
only found one issue with the fundamental differences between our
approaches.
b) I look for elements of the IP address in the domain (or, in the
sub-domain in your case).
I would recommend against this because large vendors like
MCI/WorldComm/Verizon have gone with this naming scheme for business
static users:
static-70-21-118-207.res.east.verizon.net.
My primary reaction to this is:
if their ISP wont give them a custom PTR record, then they should use
their ISP's SMTP server for outbound email. This is absolutely true,
but lots of people bristle at the suggestion that their business mail
server shouldn't talk directly to the world. So, I've been considering
moving those checks to filter_end and having it generate tags that
indicate the message should be treated as spam instead of being rejected.
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