Re: SMTP Relay
From: Lanwench [MVP - Exchange] (lanwench_at_heybuddy.donotsendme.unsolicitedmail.atyahoo.com)
Date: 03/20/05
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Date: Sun, 20 Mar 2005 10:18:21 -0500
Tarran wrote:
> Hi Lanwench,
>
> Thanks for your reply. Is there a way to autenticate a user without
> knowing there IP address?
It's either/or - either you permit the IP address to relay, or the user
authenticates using his/her username/pw. Depends what you allow in your
relay properties.
>
> Some of our users travel around very frequently and use internet
> connections from hotels or airports and we don't know there public IP
> address.
Gotcha.
>
> Most users just use OWA but a single user in all cases use POP3 and
> SMTP.
Another, better way might be to have the user connect using VPN or RPC over
HTTP so they don't need to use POP or IMAP at all - if they must absolutely
use POP, let them authenticate. I'm not in front of a server right now but I
believe you can allow only specific users to relay. Might be a a good way to
lock this down a bit.
>
> This was setup on our previous version of exchange 2k; I've tried to
> copy
> our previous setup from exchnage 2k to exchange 2k3 and It still
> doesn't work.
>
> I can't seem to get this to work. Do you know of any good tutorials
> on doing this?
What have you tried?
As I said, I don't think POP is suitable unless this is a user who never
comes into the office/uses OWA/connects directly to his/her mailbox.
>
> Many Thanks,
> Tarran
>
> "Lanwench [MVP - Exchange]" wrote:
>
>> Tarran wrote:
>>> Hi All,
>>>
>>> Does anyone one know of a tutorial for allowing certain external
>>> users to use exchange as their smtp relay server.
>>>
>>> Many Thanks,
>>> Tarran
>>
>> Well, if you know the public IP they'll be connecting from, you can
>> permit that IP to relay. If they have mailboxes on your server, you
>> can allow them to authenticate.
>> Personally, I'd just tell POP users to use their own SMTP server,
>> and if these are users with mailboxes on your server, have them use
>> OWA. I prefer not to open up any relay - even permitting
>> authenticated relay can leave you open to someone exploiting it and
>> using your server to send out spam.
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