TL;DR Postmark
CloudSonic servers support Postmark for transactional email delivery. Configure your application to send via Postmark SMTP or API and your emails leave the server cleanly.
Postmark is a transactional email delivery service focused on fast, reliable delivery of application-generated emails. CloudSonic servers are configured to route outbound email through external providers like Postmark rather than a local mail server, which is the correct approach for reliable inbox delivery. Configure your application or WordPress installation to use Postmark's SMTP credentials or HTTP API and your transactional emails will deliver reliably without the deliverability issues associated with sending from a shared hosting IP.
- Postmark account
- Verified sending domain
Postmark for Transactional Email on CloudSonic
CloudSonic servers route outbound email through Postmark rather than a local mail server, which is the correct approach for reliable inbox delivery. You configure Postmark SMTP credentials or the HTTP API in your application or WordPress installation and email leaves the server via Postmark's dedicated sending infrastructure. Postmark is specifically focused on transactional email and is known for some of the best inbox delivery rates in the industry, particularly for time-sensitive emails like password resets, order confirmations, and account notifications.