Your SMTP, Your Brand
Emails come from your domain. horizOn never sends on your behalf -- you keep full control over deliverability and branding.
Template Engine with Variables
Create reusable HTML templates with placeholders like {{username}} or {{eventTime}}. Supports up to 15 languages with translation support.
Immediate or Scheduled Delivery
Send emails instantly or schedule them for later. Cancel scheduled emails anytime via the API before they are delivered.
Built for Game Events
Tournament alerts, purchase confirmations, inactivity nudges, welcome emails. One API call triggers the entire flow.
Quick Integration
// Unity C# - Email Sending
using HorizOn;
var horizon = new HorizonClient("YOUR_API_KEY");
// Send an immediate email to a registered player
await horizon.Email.Send(new SendEmailRequest {
UserId = userId,
TemplateSlug = "welcome",
Language = "en",
Variables = new Dictionary<string, string> {
{ "username", "PlayerOne" }
}
});
// Schedule an email for later delivery
await horizon.Email.Send(new SendEmailRequest {
UserId = userId,
TemplateSlug = "appointment_reminder",
Language = "en",
Variables = new Dictionary<string, string> {
{ "appointmentName", "Dentist" },
{ "appointmentTime", "14:00" }
},
ScheduledAt = DateTime.UtcNow.AddDays(1)
});
// Cancel a scheduled email
await horizon.Email.Cancel(emailId);# REST API - Email Sending
# Send an immediate email
curl -X POST https://eu.horizon.pm/api/v1/app/email-sending/send \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"userId": "USER_ID",
"templateSlug": "welcome",
"language": "en",
"variables": { "username": "PlayerOne" }
}'
# Schedule an email for tomorrow
curl -X POST https://eu.horizon.pm/api/v1/app/email-sending/send \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"userId": "USER_ID",
"templateSlug": "appointment_reminder",
"language": "en",
"variables": { "appointmentName": "Dentist", "appointmentTime": "14:00" },
"scheduledAt": "2026-04-12T14:00:00Z"
}'
# Cancel a scheduled email
curl -X DELETE https://eu.horizon.pm/api/v1/app/email-sending/EMAIL_ID \
-H "X-API-Key: YOUR_API_KEY"Frequently Asked Questions
Ready to Integrate?
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