[FIX] Fixed sync domain problem with escape characters. Added context variable auto_created=True when creating contacts. So a possible send double opt in mail function can check for this context variable

mass_mailing_list_dynamic/models/mail_mass_mailing_list.py

@@ -3,7 +3,7 @@
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
 from odoo import api, fields, models
-from odoo.tools import safe_eval
+from odoo.tools.safe_eval import safe_eval
 
 
 class MassMailingList(models.Model):
@@ -55,7 +55,7 @@ class MassMailingList(models.Model):
             current_partners = current_contacts.mapped("partner_id")
             # Add new contacts
             for partner in desired_partners - current_partners:
-                Contact.create({
+                Contact.with_context(auto_created=True).create({
                     "list_id": one.id,
                     "partner_id": partner.id,
                 })