Re: [exim-dev] [Bug 2266] TLS SNI should default set

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Autor: Phil Pennock
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Dla: Exim-dev
CC: Viktor Dukhovni
Temat: Re: [exim-dev] [Bug 2266] TLS SNI should default set
On 2018-04-20 at 20:09 -0400, Viktor Dukhovni via Exim-dev wrote:
> Question about this "$host". Are smarthost settings ever subject to
> MX lookups, so that the actual remote SMTP server is one of the MX
> hosts of the smarthost domain?


Not with the format specified in the example configuration. It would
require explicit configuration action to subject them to MX.

The SMTP Transport is given a list of valid hostnames to try. It knows
nothing about MX lookups.

The `dnslookup` Router driver knows about MX lookups and is how they're
normally done. Here though, we're using the `manualroute` Router
driver.

<https://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_manualroute_router.html>

It's possible to follow the specified hostname with `/MX` to enable MX
lookups. That doesn't make much sense for smarthost. We can consider
adding some text explicitly warning people against that.

-Phil