Chris Edwards wrote: > On Tue, 9 Oct 2007, Jo Rhett wrote: > > | Both Crackberry and Verizon force you to use their mail servers. Some other > | data providers are now doing transparent proxy on outbound e-mail. In > short, > | the user can't always control that. > > True, to an extent. I don't know about the *berry, but imagine/hope that > verizon allow encrypted SMTP-AUTH out on the appropriate alternate port > (465/587). Do they ? >
mobiles are special (and *berry servers can be whitelisted if you need that). but in the desktop domain, blocking 587 is plain silly. and even if done, nothing prevents you from using an other port, say 10587. an no, there is no universal proxy (people find it hard to proxy known multi-channel protocols. how about proprietary ones ;-p). > However, even assuming your user *is* using the *berry server or the > verizon transparent proxy, then mails they send will in the main emerge > from a legit mail server run by grown-ups, which is far far less likely to > be blacklisted then a user sending direct from a hotel connection or > mobile dynamic IP etc etc. > > agreed. I would also add that putting mail in a quarantine (be that a Junk folder) doesn't help much if the said quarantine is so full of junk that the recipient doesn't check it. and in this case, it is worst because mail just disappeared (with an smtp reject, the sender has a chance to notice, and maybe do something). So rejecting some spam at SMTP time helps keeping the quarantine/Junk_folder "usable".
