Auto MX Email Client configuration, the right way?

[basti]

On 09.03.19 19:43, Davide Marchi via dovecot wrote:
> Hi Friends!
> An opinion.
> 
> I would like to facilitate the configuration of one's mail client
> (desktop or mobile) to my users server.
> Some time ago I asked the same question and you suggested me to use
> "Automx".
> 
> So I started of good will and I looked for the Automx documentation. And
> here the problems started as I found several inconsistencies, even
> parameters (in official documentation) that produce Apache errors..
> to complicate things, different path between deb packages and official
> version :-)
> 
> Now I've seen the new RFC 6186 specification
> (https://tools.ietf.org/html/rfc6186) that describe a "DNS way" to
> achieve the same goal.
> 
> [..]
> 4.  Guidance for MUAs
> 
>    By using SRV records as above, MUAs need initially only to prompt the
>    user for their email address [RFC5322].  The "local-part" and
>    "domain" portions are then extracted from the email address by the
>    MUA.  The MUA uses the "domain" portion as the service domain to
>    perform SRV lookups for the services it wants to configure.  If the
>    SRV lookup is successful, the target FQDN and port for the service
>    can be determined and used to complete MUA configuration.  If an SRV
>    record is not found, the MUA will need to prompt the user to enter
>    the FQDN and port information directly, or use some other heuristic.
>    In the case of multiple SRV records returned for a particular
>    service, the MUA MUST use the priority and weight fields in the
>    record to determine which one to use (as per [RFC2782]).
> 
> [..]
> 
> again:
>    [..]
>    When a user identifier is required, MUAs MUST first
>    use the full email address provided by the user, and if that results
>    in an authentication failure, SHOULD fall back to using the "local-
>    part" extracted from the email address.  This is in line with the
>    guidance outlined in Section 5.  If both these user identifiers
>    result in authentication failure, the MUA SHOULD prompt the user for
>    a valid identifier.
>    [..]
> 
> here I have the biggest doubt, in fact Thunderbird often uses only the
> username and not the whole email address, both for incoming and outgoing
> server...
> Is any of you using this second way? And possibly, do you kniw if it
> works with different clients (desktop and mobile)?
> 
> 
> Many many thanks!
> 
> Davide
> 
> 
> 

Thunderbrid als support this own way:

https://wiki.mozilla.org/Thunderbird:Autoconfiguration