North American Network Operators Group

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Re: Why do so few mail providers support Port 587?

  • From: Mikael Abrahamsson
  • Date: Sat Feb 26 18:13:14 2005

On Sat, 26 Feb 2005, Jim Popovitch wrote:

> 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?

If you limit port 587 sending to let's say 1000 email per day you probably 
cover 99.9% of all normal users, and you're very likely to catch the 
spammers abusing an account.

Mikael Abrahamsson    email: [email protected]