Self-hosted apps that integrate with SMTP (email notifications)

4 open-source, self-hostable projects list SMTP (email notifications) as an integration.

• qBittorrentqBittorrent is an open-source, cross-platform BitTorrent client with a WebUI for remote management, aiming to be a free alternative to µTorrent.
• graylogSelf-hosted open-source log management and SIEM server: aggregate and search logs, transform them in pipelines, alert and build dashboards.
• ReadurSelf-hosted OCR document management system with multi-language support, full-text search, and S3/WebDAV sync for individuals and teams.
• ElkarBackupElkarBackup is a self-hosted, open-source backup solution centralizing Linux and Windows backups via web UI, built on rsync/rsnapshot with instant recovery.