diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 6ad7c7dbf31..795a0a8ed0e 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -3277,7 +3277,12 @@ class AccountMove(models.Model):
             if is_internal_partner(partners[0]):
                 # Search for partners in the mail's body.
                 body_mail_addresses = set(email_re.findall(msg_dict.get('body')))
-                partners = [partner for partner in self._mail_find_partner_from_emails(body_mail_addresses, extra_domain) if not is_internal_partner(partner)]
+                company_id = custom_values.get('company_id', self.env.company.id)
+                partners = [
+                    partner
+                    for partner in self._mail_find_partner_from_emails(body_mail_addresses, extra_domain)
+                    if not is_internal_partner(partner) and partner.company_id.id in (False, company_id)
+                ]
 
         # Little hack: Inject the mail's subject in the body.
         if msg_dict.get('subject') and msg_dict.get('body'):