When mailings have no responsible, KPIs emails are broken as there is no
from and to on the mail. This leads to mails being invalid and set in
exception.
Moreover currently author and from / to of those D+1 emails are not coherent
as author is current user (generally odoobot as this is generated through
a cron) while from and to are based on mailing responsible.
In this commit we make statistics emails more coherent
* when a responsible is set on the mailing: author, from and to are linked
to the responsible;
* when there is no responsible, current user is set as it may be sent by
regular people;
* reply-to is set to company email as it is often the case with 'marketing'
emails;
Task-2686586 (Repair mailing statistics email)
X-original-commit: 95a21ca16f560cf4341c547f6bc909d3261acd1b
Part-of: odoo/odoo#79877
Thibault Delavallée
73672cfc9f