UPDATE:

There is a similar method mentioned at https://www.odoo.com/forum/help-1/question/odoo-13-ent-a-user-is-a-salesperson-for-multiple-companies-how-can-they-send-via-multiple-email-domains-172031 so maybe read both that and this so you can choose the best solution?

This configuration allows Odoo to send emails using different From and Reply-To email addresses (typical for customers who own different websites/brands). The goal is to manage email communication that looks like it's coming from different organizations in the same Odoo instance with each organization using its own domain. As a note, the explanation below works whether you have a single- or multi-company environment as the 'company' model is not used at all here.

Example:
jsmith@company1.com and johnsmith@company2.org are 2 email addresses belonging to the same person who works in an Odoo instance. Sometimes John needs to send emails to prospects as jsmith@company1.com and his prospects need to see catchall@company1.com when they reply. And sometimes John needs to send emails to other prospects as johnsmith@company2.org and his prospects need to see catchall@company2.org when they reply. Every replies need to get back in the instance and associated with the chatter of the appropriate record.


First of all multiple email domains ≠ multiple email servers. It's possible to use a single email server which handles multiple domains:

- GSuite: https://support.google.com/a/answer/175747?hl=en
- Fastmail: https://www.fastmail.com/help/receive/domains.html

Using a single mail server is better because:

- it's easier to administer
- it's cheaper

If this is not possible and the customer insists on separate servers you can configure them as usual (1 incoming + 1 outgoing per email server).

Two main things that need to be handled for this to work are:

- setting a different From per user and per domain, and
- setting a different Reply-to per user per domain

We can do this with email templates. When a user wants to communicate with the non-default email address they'll need to select a specific email template by using the full mail composer. If you use "Send message" directly in the chatter, it will use the default email address.

In the case of 1 email server:

If you use a single mail server you can create a custom Boolean field that you enable on templates belonging to the second company: x_from_company2

In the case of 2 email servers:

We don't have to create a custom boolean. We need to specify the distinct 'outgoing mail server' on these templates so we know these should use the non-default email.

To handle the different From the simplest option is to create a custom character field (e.g. x_email_company2) on res.users which will hold the email address for the second email server.

Your email template can then have the following From:

${object.user_id.x_email_company2 |safe}

This approach doesn't work for Reply-To. It's overridden with the catchall system parameters. Instead we can create an automated action:



In the case of 1 email server: Make sure to set the correct outgoing email server ID. In case you are using a single email server modify the domain to use the custom Boolean on the template described above (ie. x_from_company2).

In the case of 2 email servers: specify a domain that depends on the boolean on the template (x_from_company2).

Finally, on the 'full mail composer' wizard, you can move the 'email template' field at the top and rename it 'From'. Selecting "From company1.com" or "From company2.org" will allow the user to use the intended from and reply-to.