handle invalid email in email_can_be_used_as_mailbox

app/email_utils.py

@@ -19,7 +19,7 @@ from typing import Tuple, List, Optional, Union
 import arrow
 import dkim
 import spf
-from email_validator import validate_email, EmailNotValidError, ValidatedEmail
+from email_validator import validate_email, EmailNotValidError, ValidatedEmail, EmailSyntaxError
 from flanker.addresslib import address
 from flanker.addresslib.address import EmailAddress
 from jinja2 import Environment, FileSystemLoader
@@ -520,7 +520,11 @@ def email_can_be_used_as_mailbox(email: str) -> bool:
     - one of custom domains
     - a disposable domain
     """
-    domain = get_email_domain_part(email)
+    try:
+        domain = get_email_domain_part(email)
+    except EmailNotValidError:
+        return False
+        
     if not domain:
         return False