* [MailTime 4.1.0](https://github.com/veliovgroup/mail-time) – Email queuing system that extends Nodemailer with multi-SMTP rotation, storage-backed retries, and horizontal scaling support.

* [go-premailer v1.34.0](https://github.com/vanng822/go-premailer) – Inlines CSS into HTML email for Go.

* [Mailspring 1.21.1](https://github.com/Foundry376/Mailspring) – Beautiful, fast mail client for managing emails across multiple platforms.

* [Maddy Mail Server v0.9.5](https://github.com/foxcpp/maddy) – Composable all-in-one mail server implementing SMTP (MTA/MX), IMAP storage, and security protocols such as DKIM, SPF, DMARC, and DANE.