Re: [cobalt-users] what is email relaying denied?

[Hendrik Runte <cobalt@xxxxxxxxxx>]

> Sorry, i know that this is a expert user cobalt list, but i need to make a
> newbie question, i got problem when i try to send a email , i receive a
> message "email relaying denied" when i use pop3 email account with a dial
> up access, what is wrong?, the problem i resolve when i get into email
> server preferences and i record the domain of the domain i try to send, but
> i can't beleive this is the solution because think all the domain in the
> world there are now, i couldn't record one by one all the domains that
> exist now in internet, i beleive i'm wrong, please somebody can explain me
> please?
> 
> 
> David Rojas V, Ing.
> Advicom.- Audio, Video y Comunicaciones Cia. Ltda
> Broadcast Technology & Telecommunication Engineering
> E-mail:    drojas@xxxxxxxxxxxxxx
> Internet:  http://www.advicom-ec.com
> 
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> 

One of sendmail's major problems is the protocol itself: SMTP was invented
to deliver all mail. Later the world invented spam and so some crooks found
many ways to send their mail using other's mail transport agents.

In order to prevent this, the use of sendmail is restricted. There are some
different means to keep people out of your sendmail:

You tell sendmail first, which mails it should deliver. Unfortunately, it's
not possible to tell every single trusted mail address first. But you can
allow whole networks to be delivered. On the other hand this is not very
secure any more.

You tell sendmail to deliver all mail originating from a specific IP
address. But will ignore people with dynamic IPs as in your case.

You give sendmail the capability to check your identiy by having a look into
the log files your pop3 server created some minutes before. This is called
SMTP-after-POP.

To get this small plug-in that will let your problems simply vanish, check
the cobalt update site Cobalt->Support->Downloads for "POP Before SMTP
Relaying 4.0.7".

Install this upgrade by copying the URL into the upgrade form in your
maintenance area of the GUI.

You can do no wrong.

Regards,

Hendrik.
--
hr@xxxxxxxxxx