How to ensure fast and stable transactional email delivery
Transactional emails are messages that users expect immediately: one-time codes, registration confirmations, password resets, login notifications. If such emails are delayed or lost, user experience and trust in the service suffer.
To avoid failures and ensure precise delivery, it’s important to have the right infrastructure — from event-triggered sending to a stable delivery channel.
What affects delivery accuracy
Sending an email does not mean it will reach the inbox. Delivery accuracy depends on several technical factors.
IP address reputation
Email services filter messages based on IP history. If spam was previously sent from this IP, emails risk going to the spam folder or being rejected outright. The solution is to use clean and warmed-up IP addresses. BSG offers dedicated IPs and tools to manage reputation.
Sender DNS authentication
Setting up SPF, DKIM, and DMARC allows mail servers to verify that the email was really sent from your domain. Without these records, emails are more often blocked or flagged as suspicious. Many providers, including BSG, offer ready-made instructions to configure and verify these settings.
Control of volume and sending pace
A sudden surge in the number of emails can trigger filters, especially with a new domain or IP. It is important to maintain a steady sending rhythm and avoid spikes. BSG’s infrastructure allows transactional email sending to be distributed over time and scaled according to demand.
Content quality
Although transactional emails rarely raise suspicion, it’s best to avoid spam-like elements: attachments, many links, or marketing language. Simplicity and clear structure are key.
How event-triggered sending works via API
Transactional emails must be sent immediately after a user action — registration, order, code request. This requires event logic and a reliable API.
Event → trigger
Your service detects a user action — for example, clicking “Reset Password”. This event triggers an API call to send the email.
API request with parameters
The request includes the recipient’s address, template ID, and variables (e.g., username, access code). Authorization is done via a secure key. This is standard practice, and BSG provides clear documentation for quick integration.
Instant email sending
Once the request is received, the service generates the email and sends it through its mailing infrastructure. It’s great if the platform has high throughput — BSG supports up to one million emails per hour, so can easily handle peak loads.
Status and logs feedback
The API returns information about successful or failed delivery. This helps monitor problems in real-time: invalid addresses, blocks, template errors.
How to maintain a clean channel and avoid spam
Even technically correct emails can land in spam if the delivery channel is not clean. Here are key measures to avoid this:
- Use dedicated IP addresses. If any user of a shared IP address breaks the rules, the entire group suffers. Using a dedicated IP and monitoring its reputation is better. BSG allows you to connect your own IP and also manage multiple IPs via a dashboard.
- Monitoring and analytics. It is important to track sending, delivery, opens, and errors. This helps quickly identify issues. BSG provides detailed real-time analytics including message status, bounce rates, and technical errors.
- Gradual volume increase. When starting with a new domain or service, avoid sending thousands of emails at once. Gradually increasing volume helps avoid filtering.
- Simple text templates. Transactional emails should be concise. The fewer extra elements, the less chance for spam filters to trigger. Avoid graphics, scripts, and unusual styles. The email must be readable in browsers and mail clients alike.
The BSG platform provides all the necessary tools for automated and fast transactional email sending. Using the API, you can trigger delivery by event, monitor its outcome, and be confident the email will arrive — even under high load.