> ## Documentation Index
> Fetch the complete documentation index at: https://kw.hellenictechnologies.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Transactional

> Transactional email setup: SMTP, Resend, Postmark.

Transactional emails are the confirmation emails, order receipts, password reset links, booking confirmations and notification emails that your website sends automatically in response to user actions. When these don't arrive — because they're caught by spam filters, rejected by the recipient's mail server, or simply not configured correctly — it damages customer trust and creates support overhead.

The root cause of most transactional email deliverability problems is the same: WordPress sending email via PHP's built-in `mail()` function, which has no authentication, no DKIM signing, and no reputation behind it. Receiving mail servers treat these emails with justified suspicion. The fix is to route transactional email through a dedicated sending service with proper authentication and a maintained sender reputation.

## How We Set It Up

* **SMTP configuration** — We configure WordPress (via WP Mail SMTP or similar) to route all outgoing email through a dedicated SMTP relay rather than the server's `mail()` function
* **Sending service selection** — For most sites we use Resend or Postmark, both of which provide excellent deliverability, proper DKIM/SPF/DMARC signing, and detailed delivery logs; for high-volume senders we evaluate Sendgrid or Amazon SES
* **DNS authentication records** — SPF, DKIM and DMARC records are configured on your domain's DNS to authenticate outgoing email and instruct receiving servers to trust it
* **Email template review** — WooCommerce and booking plugin email templates are reviewed for spam trigger patterns and updated where needed
* **Delivery testing** — All transactional email types are tested end-to-end, including spam filter testing via Mail Tester and inbox placement verification

## Sending Services We Work With

* **Resend** — Modern developer-first email API; excellent deliverability; clean React Email templates supported; recommended for new setups
* **Postmark** — Industry standard for transactional email; very strong deliverability; detailed bounce and spam complaint tracking
* **SendGrid** — Good option for higher-volume senders; marketing and transactional in one platform if needed
* **Amazon SES** — Lowest cost at scale; requires more setup effort but appropriate for high-volume applications with in-house technical management

## Monitoring

Once configured, we set up delivery monitoring: bounce rate tracking, spam complaint rates, and alerts if sending volume drops unexpectedly (which can indicate a configuration failure). Transactional email is included in our standard support plan monthly reviews.