basti <mailinglist@???> (Fr 24 Jan 2014 11:24:27 CET):
> Hello,
> when I enable
>
> On 23.01.2014 16:16, Heiko Schlittermann wrote:
> > require message = we accept tls connections only
> > condition = ${if def:tls_cipher}
>
> other mail server (arcor, greatnet, ...) can't connect to the server.
Of cause. I didn't advise it :) It was just there as an example, how you
can force the sending MTA to use TLS. Not all MTAs can be forced… For
that to work we've to wait until some of the BIG mail hosters requires
incoming MTA communication to use TLS.
> And when I use PLAIN in my Thunderbird settings I get a
> "RELAY NOT PERMITTED", I think it is caused by
>
> begin auth
> server_advertise_condition = ${if def:tls_cipher}
You need to enable encrypted connections in your MUA.
Normally I select 'always use TLS' and direct the connections to port
587 (Submission).
>
> Is there a way to say:
>
> MTA -> MTA communication is PLAIN
> MUA -> MTA musst be SSL
The relevant portions of the config are (not cross checked with the spec
file, this I may be wrong with the naming of some options.)
(Our real world configs look a bit more complicated, but this should be
a good starting point for you own configuration.)
# global
daemon_smtp_ports = 25 : 465 : 587
tls_on_connect_ports = 465
acl_smtp_mail = acl_check_mail
acl_smtp_rcpt = acl_check_rcpt
# acl
begin acl
acl_check_mail:
# on port 25 mostly MTA will talk to us, they can't
# authenticate, we have to accept the MAIL FROM
accept condition = ${if eq{$interface_port}{25}}
# The other ports 465 and 587 are for MUAs, the are expected
# to authenticate
accept authenticated = *
deny message = please authenticate first
acl_check_rcpt:
# you will have lots of othere checks (dnsrbl,
# recipient/sender verification, …
accept authenticated = *
accept domains = +local_domains : +relay_to_domains
deny message = relaying denied, please authenticate first
begin authenticators
plain:
…
# authentication is only advertised if the session
# is secure
server_advertise_condition = ${if def:tls_cipher}
# if I do not want authentication on port 25:
# ${if and{{def:tls_cipher}{ !eq{$interface_port}{25} }}}
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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