We have set up a new outgoing mail server for our EmailMarketing-MassMailing (IONOS-MAIL-SRV).

We still want to send Transactional Emails the standard Odoo Mail Server

...but the Transactional emails get sent by this EmailMarketing dedicated Mail Server too

STEPS TO REPRODUCE:
In Configuration>Technical>Outgoing mail servers :

For EmailMarketing (NOT transactional emails) : We have set up a new outgoing mail server :  IONOS-MAIL-SRV
which we have selected in Configuration > Email Marketing :
[v]dedicated Server : IONOS-MAIL-SRV

BUT :
Transactional Emails instead of being still sent via the standard Odoo Mail Server, are sent via the IONOS-MAIL-SRV outgoing mail server

As described in the official Odoo documentation : https://www.odoo.com/documentation/13.0/applications/general/email_communication/email_servers.html
we expect that:

* TRANSACTIONAL emails should be sent via the standard Odoo Mail Server -

* MASS MAILING/EMAIL-MARKETING emails should be sent by our added IONOS-MAIL-SRV outgoing mail server


How to fix it to set 2 different outgoing mail servers correctly: one for transactional and the other for EmailMarketing ?

Thank you for your help,

Best regards,

Sylvain