With ETRN, the public SMTP server will attempt to connect to the Intranet
SMTP server to deliver the mail. Mail doesn't get delivered over the same
connection that issued ETRN on.
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, March 08, 2000 9:29 AM
> To: [EMAIL PROTECTED]
> Subject: ETRN to secure emails transfers
>
>
>
>
> Hi,
>
> Sorry for my poor English...
>
> I would like to chech the security level of the following
> infrastructure for
> receiving mails from Internet:
>
> A first public SMTP server is located on the DMZ and receives
> all the mails
> coming from Internet.
> The primary internal and private SMTP server is located on
> the Intranet and
> sends every 30 minutes an ESMTP request to the external SMTP
> server to retrieve
> the stored mails.
>
> With this solution, I hope I will not have to make a hole in
> my Firewall
> configuration accepting a connection from the DMZ to the Intranet.
>
> Is it true? Is this solution really secure?
>
> I'm waiting for your comments.
>
> Tx
>
> Bertrand Sorez
>
>
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