SendLayer A dedicated transactional email service over HTTP API: add a domain, verify it, copy your API key.
Brevo Brevo (formerly Sendinblue) is a transactional email API. NimblyMail talks to it over HTTPS - no SMTP ports involved.
ZeptoMail Zoho's transactional email service, with regional API endpoints for data residency or latency reasons.
Default (PHP Mail) Uses PHP's built-in mail() function. No configuration required, but not recommended for production sites.
Email Providers NimblyMail supports nine methods for sending WordPress email. Compare them and pick the right one for your site.
Other SMTP Send WordPress email through any standard SMTP server using a host address, port, and credentials.
Gmail / Google Workspace Send through the Gmail API using OAuth 2.0, so NimblyMail never stores your Google password.
Outlook / Microsoft 365 Authenticate via Microsoft OAuth and send through smtp.office365.com using XOAUTH2 - no Azure app registration needed.
Amazon SES The most cost-effective option for high-volume sending, with excellent deliverability once your domain is verified.
Resend A transactional email API built for developers: add a domain, generate an API key, and paste it into NimblyMail.
