Re: [exim] Secure authentication and tls_on_connect

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Autor: Stephen Gran
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A: exim-users
Assumpte: Re: [exim] Secure authentication and tls_on_connect
On Tue, Dec 06, 2005 at 06:19:44PM -0800, Mark Edwards said:
> I want to set up authentication in exim so that users may only
> authenticate securely, to eliminate the possibility of passwords
> being passed in the clear. To this end, I have added the recommended
> line to my authenticators:
>
> server_advertise_condition = ${if eq{$tls_cipher}{}{0}{1}}
>
> Works great, except it breaks Outlook Express Mac, which uses the
> tls_on_connect functionality. Outlook works fine if the LOGIN
> authenticator has no server_advertise_condition set, but breaks
> otherwise, claiming the server doesn't support authentication.
> Unfortunately, if I remove server_advertise_condition from from my
> LOGIN authenticator, other clients can then be set to authenticate in
> the clear, which I do not want.
>
> Can anyone suggest a way to allow Outlook Express Mac clients to
> connect without offering the possibility of any unencrypted logins?


steve@mercury:~$ grep ssmtp /etc/services
ssmtp           465/tcp         smtps           # SMTP over SSL


You'll want to listen on port 465, and use the tls_on_connect option for
that port only. Check the spec for details.
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