diff --git a/src/relay_minitest/conftest.py b/src/relay_minitest/conftest.py
index e63a08d..8b4a613 100644
--- a/src/relay_minitest/conftest.py
+++ b/src/relay_minitest/conftest.py
@@ -1,3 +1,4 @@
+import ipaddress
 import ssl
 
 import pytest
@@ -15,6 +16,13 @@ def pytest_addoption(parser):
 
 
 def get_ssl_context(maildomain):
+    is_ip = False
+    try:
+        ipaddress.ip_address(maildomain)
+        is_ip = True
+    except ValueError:
+        pass
+
     if (
         maildomain.startswith("_")
         or maildomain.startswith("10.")
@@ -22,6 +30,7 @@ def get_ssl_context(maildomain):
         or maildomain.startswith("192.168.")
         or maildomain == "localhost"
         or maildomain == "127.0.0.1"
+        or is_ip
     ):
         ctx = ssl.create_default_context()
         ctx.check_hostname = False