Reliable WordPress email delivery with multiple providers, two connections, Return Path, Reply-To and visual AND/OR routing.
Alternatives to Lettr – Email API
Plugins below are selected for functional relevance and current directory signals. Active-install counts do not affect this ranking.
Relevant replacements
WordPress plugins with similar use cases
Compatibility and update metadata provide context, not a quality guarantee. Review each plugin’s details for your site.
SwiftTrap for Mailtrapv3.0.3
Send WordPress emails through the Mailtrap Email API (not SMTP). Bulk and transactional streams, categories, suppression list, email log.
Volanea Email Deliveryv1.0.0
Send WordPress email through the Volanea API instead of PHP mail(), with an automatic fallback so no message is ever lost.
Send every WordPress email through SendFleet. One API key, no SMTP settings. Your own Amazon SES free for 3,000 emails a month, or ours from $5.
EnjinMel SMTPv0.2.5
Replace WordPress default email sending with Enginemailer API for enhanced deliverability and reliability.
onesendv1.0.0
EU-sovereign transactional email for WordPress. Route site mail through onesend: EU-hosted, EU-billed, GDPR-native, no US subprocessor.
SMTP Senpaiv1.1.3
Send WordPress email through SMTP Senpai by MailSenpai, an EU-hosted SMTP relay and email API. API key or SMTP, test email, domain check, log.
Send all WordPress email through Cloudflare Email Service. No SMTP setup. Includes test emails, a searchable email log and a fixed sender name.
SendSend Mailerv1.0.0
Send all WordPress email (password resets, order receipts, form notifications) through the SendSend email API instead of your web server.
Changrid Email Deliveryv0.5.0
Send WordPress email through Changrid. Start free, then add provider routing, delivery visibility, and controlled native-mail fallback.