diff --git a/notifiers/core.py b/notifiers/core.py
index 1a640341..ed2e6623 100644
--- a/notifiers/core.py
+++ b/notifiers/core.py
@@ -11,7 +11,7 @@
 from jsonschema.exceptions import best_match
 
 from .exceptions import BadArguments, NoSuchNotifierError, NotificationError, SchemaError
-from .utils.helpers import dict_from_environs, merge_dicts
+from .utils.helpers import dict_from_environs, merge_dicts, text_to_bool
 from .utils.schema.formats import format_checker
 
 DEFAULT_ENVIRON_PREFIX = "NOTIFIERS_"
@@ -162,7 +162,37 @@ def _get_environs(self, prefix: str | None = None) -> dict:
         if not prefix:
             log.debug("using default environ prefix")
             prefix = DEFAULT_ENVIRON_PREFIX
-        return dict_from_environs(prefix, self.name, list(self.arguments.keys()))
+        environs = dict_from_environs(prefix, self.name, list(self.arguments.keys()))
+        return self._coerce_environs(environs)
+
+    def _coerce_environs(self, environs: dict) -> dict:
+        """
+        Coerces environment variable strings to the types declared in the provider schema.
+        Environment variables are always strings; this converts ``"true"``/``"1"`` to :class:`bool`
+        and numeric strings to :class:`int` or :class:`float` where the schema requires it.
+
+        :param environs: Raw environ dict (all values are strings)
+        :return: Environ dict with values cast to schema-declared types
+        """
+        properties = self.arguments
+        coerced = {}
+        for key, value in environs.items():
+            prop_type = properties.get(key, {}).get("type")
+            if prop_type == "boolean":
+                coerced[key] = text_to_bool(value)
+            elif prop_type == "integer":
+                try:
+                    coerced[key] = int(value)
+                except (ValueError, TypeError):
+                    coerced[key] = value
+            elif prop_type == "number":
+                try:
+                    coerced[key] = float(value)
+                except (ValueError, TypeError):
+                    coerced[key] = value
+            else:
+                coerced[key] = value
+        return coerced
 
     def _prepare_data(self, data: dict) -> dict:
         """
diff --git a/tests/test_core.py b/tests/test_core.py
index 6fe0fdae..4a27828f 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -4,7 +4,7 @@
 import pytest
 
 import notifiers
-from notifiers import notify
+from notifiers import get_notifier, notify
 from notifiers.core import SUCCESS_STATUS, Provider, Response
 from notifiers.exceptions import (
     BadArguments,
@@ -83,8 +83,6 @@ def test_prepare_data(self, mock_provider):
 
     def test_get_notifier(self, mock_provider):
         """Test ``get_notifier()`` helper function"""
-        from notifiers import get_notifier
-
         p = get_notifier("mock_provider")
         assert p
         assert isinstance(p, Provider)
@@ -189,3 +187,19 @@ def test_direct_notify_positive(self, mock_provider):
     def test_direct_notify_negative(self):
         with pytest.raises(NoSuchNotifierError, match="No such notifier with name"):
             notify("foo", message="whateverz")
+
+    def test_environ_bool_and_int_coercion(self, monkeypatch):
+        """Env vars for boolean/integer schema fields must be coerced from string (issue #387)."""
+        p = get_notifier("email")
+
+        prefix = "COERCE_TEST_"
+        env_prefix = prefix + p.name + "_"
+        monkeypatch.setenv((env_prefix + "tls").upper(), "true")
+        monkeypatch.setenv((env_prefix + "ssl").upper(), "false")
+        monkeypatch.setenv((env_prefix + "port").upper(), "587")
+
+        environs = p._get_environs(prefix)
+        assert environs["tls"] is True, "'true' string must coerce to boolean True"
+        assert environs["ssl"] is False, "'false' string must coerce to boolean False"
+        assert environs["port"] == 587, "'587' string must coerce to integer 587"
+        assert isinstance(environs["port"], int)