Thibault Delavallée
3a0da2278f
PURPOSE
Allow alias domains to be multiple, notably to be used in a multi company
environment where each company has its own alias domain.
SPECIFICATIONS
Make mail gateway support alias domains instead of relying on configuration
parameters. This implies the following changes
* destination alias check is now based on full email by default. Previously
only left-part of aliases were checked. Optionally an allowed list of
domains could be additionally checked. Default from now on is to check
the complete email e.g. 'sales@mydomain.com' != 'sales@mydomain.in';
* detection of direct write to catchall implies checking all domains
catchall emails;
* detection of write to bounce implies checking all domains bounce emails;
* when having to send bounce emails using the bounce alias as mailer-daemon,
find the bounce email from the relevant company;
However we have to ease transition from the old ICP-based model used since
ages to the new domain-based model. Notably a common usage of mail gateways
is to do mail forwarding e.g. forward mail from domainA to domainB without
rewriting destination. It means that e.g. sales@mail.domainA should be
considered as a valid alias equivalent to sales@mail.domainB. This was
working due to left-part only check of destination aliases. In order to
keep this setup working after migration a flag is added on aliases allowing
to keep the detection of those aliases based only on local parts.
In summary: When searching for aliases, mailgateway now either checks for
exact email, either for matching local parts when the flag is active. This
is not the default behavior, as we want a stricter comparison of emails by
default but it will be the default behavior at **migration time**.
The 'mail.catchall.domain.allowed' configuration parameter is kept. It is
used only for left-part check aliases, allowing to limit the scope of the
match.
Task-36879 (Mail: Support Multi Domains Aliases)
Part-of: odoo/odoo#76734
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