On Oct 12, 2007, at 9:40 AM, Robin Becker wrote:
these all sound very reasonable. However, we use the same IP for
several virtual hosts ie we have more than one domain name so the
reverse DNS is not clear to me. Is the from address inspected for
comparison with the RDNS ie if I claim to be sending from xxx.com
should my RDNS point back to xxx.com? Presumably I can have only
one IP-->domain ptr. I suspect it will be easier to set up the
front end machine as that is supposed to be for the same client.
The checking will work fine with virtual domains. What matters is that
DNS(rDNS(IP)) = IP = DNS(vhost)
I think I've got that right. (It's a bit more complicated to state
when MXes and multiple A records for the same name are considered,
but this is the general idea.)
Also it's not so much the header FROM or the envelope FROM, but the
HELO string that is checked here. For SPF and DomainKeys, it is the
envelope FROM that is checked against the IP. Presumably your mailer
gives a constant HELO irrespective of the vhost that is in the
Automatic mailing is fine. What is important is how the email
addresses were acquired.
this isn't automatic, the sales people manually enter all the details.
And how do the sales people acquire the data? I'm sure that it's
okay, but you may want to have a small description of the process on
your web page that you could point postmasters to if a question arises.
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