At 07:55 AM 10/22/2003, you wrote:
Sorry, that doesn't make a lot of sense to me...
If someone, as in your example, is connected to AOL and is sending a
message to an MSN address, then at that specific point in time, they
are not your customer, they are an AOL customer and as such should be
using AOL's smtp servers, definatly not yours.
In your post, you claim that would be eating up your bandwidth in both
directions, as the message came in from AOL and then as it left going to
MSN. If you are allowing people connected to AOL to send email to MSN via
your smtp server, then you are an open relay.
I can't believe that's what you are actually stating, so I must be
misunderstanding your post, sorry.
In any case, I had originally explained how I prevent my customers that are
connected to my dialup ports, and that therefore receive dynamic IPs, from
sending outbound traffic destined to port 25, thereby forcing them to use
my smtp
servers. I do not see how my blocking of locally connected customers to
external
port 25 connections relates to your example of someone connected to AOL
and sending
email to MSN.
i have a ton of customers that roam, and to use their @L7.net e mail address,
there is obviously no way they can use an aol mailserver for this.
(however, aol firewalls all of that kind of stuff, so the mail does get out
eventually because of they way they do it, but it really kinda sucks)
>I guess you are in the case where clients send mail from inside your network
>to the outside.
>So going through your smtp server costs you no extra bandwith anyway.
>But when they send mail from outside to outside ( for example my client has
>an internet access with AOL and sends a mail to MSN),
>I have no reason to get their mails relayed by my SMTP server, costing me
>bandwith in both sides ( incoming and resend ) + server utilization
use mikes smtprcv, block at the door, and call it a day.
>I think that some of us manage mail mostly for their own organization, while
>others act as small ISP, both situations are very different
i have a mail load in excess of a million a day on my big server, with 40,000
mailboxes, and emwac holds up fine.
-dd
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