WooCommerce is the most popular e-commerce plugin for WordPress. It has no sending infrastructure of its own — it uses WordPress's pluggable wp_mail() layer, so you point it at an SMTP relay or ESP plugin to send transactional and marketing mail.
Point WooCommerce at MailKite via the WP Mail SMTP plugin and smtp.mailkite.dev. See /docs/integrations/woocommerce.
Read the full setup guideA minimal, copy-paste starter. Swap in your own domain and API key.
# Any app that accepts an SMTP server works with MailKite
MAIL_HOST=smtp.mailkite.dev
MAIL_PORT=587 # STARTTLS (or 465 for TLS)
MAIL_ENCRYPTION=tls
MAIL_USERNAME=mailkite # username is ignored
MAIL_PASSWORD=mk_live_... # your MailKite API key
MAIL_FROM_ADDRESS=you@yourdomain.com # on a verified domain
MAIL_FROM_NAME=WooCommerce Point a domain, set one SMTP endpoint, send your first email in minutes. Unlimited domains, no credit card.