By default, Odoo uses the main partner email (field email) when sending invoice reminders.

If you want reminders to go to a specific address (e.g. a dedicated billing contact), you have two main options:

1. Configure a specific contact for invoicing
   • Go to the customer form.
   • Under the Contacts & Addresses tab, create a child contact of type Invoicing.
   • Enter the email address you want reminders to be sent to.
   • Odoo will then use this address for invoice-related communications.
2. Use the "Accounting Email" field (Enterprise)
   • In some Odoo versions, you can enable and fill the Invoice Reminder Email field in the partner settings.
   • Once set, Odoo will automatically send payment reminders to that address instead of the general one.

👉 This way, you separate the general contact email (for sales orders, quotations) from the billing email (for accounting reminders).

If you’re on Community and don’t see this option, you may need a customization (small module) to map reminders to a custom field

Hi,

In Odoo standard (v17/18), invoice reminders (from Accounting → Customers → Follow-up Reports / Reminders) are sent by email to the default email address of the customer (res.partner.email).

There is no built-in mechanism to use a different email address field like “reminder mail-address” out of the box.

- How to Customize

            1- Add a custom field on res.partner (e.g. reminder_email).

             2- Override the reminder sending logic (account_followup module → _send_email method) to check:

                   * If partner.reminder_email exists → use that

                   * Else → fallback to partner.email.

                  Eg :- email_to = partner.reminder_email or partner.email

Odoo will always use the customer’s main email for reminders. If you want a separate "reminder mail-address," you’ll need a small customization to override the reminder logic.

Hope it helps