jacques silberstein via Exim-users <exim-users@???> (Do 27 Feb 2020 18:31:39 CET):
>
> I'm running a long time ago an exim4 smtp server. This server send all outgoing mail to a smarthost while I haven't a static IP. When I'm traveling I tray to use the smtp relay of ma guest but it is not always possible.
> So, I wish to send my mail (specially answers) to my server which should the relay then to it's usual smarthost.
>
> My question is : how to configure exim4 to tha in a safe way. I did thing I should use a form of authentication in order to ensure than only my massage are relayed. But after...
>
Yes, your thoughts are correct, you need a way of authentication and
authorization.
Authentication can be provided by
- IP address (unsafe and not possible in your situation)
- SMTP AUTH (username, password) sent by the client to the server
- TLS client certificate sent by the client to the server
Authorization is simple, as probable you will accept all authenticated
users/clients.
Exim provides means for all three types of authentication. If you use
SMTP AUTH or TLS client certificates depends on the capabilities of your
local (road warrior) system.
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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