add email sending functionality with Django Ninja API

api/admin.py

@@ -0,0 +1,49 @@
+import smtplib
+
+from django.contrib import admin
+from django import forms
+from django.core.exceptions import ValidationError
+
+from api.models import MailProvider
+
+class MailProviderForm(forms.ModelForm):
+    host_password = forms.CharField(widget=forms.PasswordInput(render_value=True))
+
+    class Meta:
+        model = MailProvider
+        fields = "__all__"
+
+    def clean(self):
+        cleaned_data = super().clean()
+        host = cleaned_data.get("host")
+        port = cleaned_data.get("port")
+        user = cleaned_data.get("host_user")
+        password = cleaned_data.get("host_password")
+        use_tls = cleaned_data.get("use_tls")
+
+        if host and port and user and password:
+            try:
+                connection = smtplib.SMTP(host, port, timeout=10)
+                if use_tls:
+                    connection.starttls()
+                connection.login(user, password)
+                connection.quit()
+            except Exception as e:
+                raise ValidationError(f'Could not connect to the mail server: {e}')
+        return cleaned_data
+
+@admin.register(MailProvider)
+class MailProviderAdmin(admin.ModelAdmin):
+    form = MailProviderForm
+    list_display =  ("from_email", "host", "port", "use_tls")
+    search_fields = ("from_email", "host_user", "host")
+    list_filter = ("use_tls",)
+
+    fieldsets = (
+        (None, {
+            "fields": ("from_email", "host", "port", "use_tls")
+        }),
+        ("Authentication", {
+            "fields": ("host_user", "host_password")
+        }),
+    )