And how do you deduce whether the IP is static or dynamic?
Several ISPs - especially in the united states - do one or more of :
1. Port 25 outbound blocks on their dialup pool so that outbound smtp traffic is forced through their smtp servers
2. Submitting their dynamic IP ranges to the MAPS DUL, easynet.nl dynablock and other such lists of dynamic IP ranges.
3. Consistent reverse dns with a pattern like "ppp" or "dialup" in it for their dialup pools
If you are doing this, then still my point mentioned in my essay stands. Most of the small companies in India are using dial-up and those people cannot send you mails.
Sure they can, if they set their mailserver to send out through a static IP mailserver ...
srs
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