North American Network Operators Group|
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Re: Why do so few mail providers support Port 587?
> (as you say, blocking port 587 makes no sense). Let me get this straight... it makes no sense to block a port that will allow unlimited relaying of all sorts of malware by only verifying an easily purchased or stolen username and password? If someone uses a big-ISP network to forward business impacting malware thorough your small-biz email server, using questionably gained 587 credentials, who is going to get sued? Is it safe enough for the big-ISP to say "we just route whatever our customer de'jour sends"? I am against port blocking as much as the next guy, I just see port 587 as a disaster waiting to happen. ISP provided email credentials are universally transmitted in plain text. If an (insert any ISP here) employee can be arrested for selling email addresses to spammers, what keeps them from collecting and selling 587 credentials? I understand that ISPs are trying to find a roaming solution for your customers. I just want you to find one that is *better* than simple port-587-auth-before-open-relay. For starters I would recommend that 587 access NOT be enabled by default for all users. Let it be by special request, and even then with some "teeth" involved. -Jim P.