Top pick
Cross-platform mail, calendar, and RSS client with extension support.
emailimapcalendar
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8 tools match your filters
Simple GNOME-aligned desktop mail client focused on conversation reading.
emailgnomegtkimap
Honorable mention
Messenger using email as transport—chat over your existing IMAP/SMTP accounts.
chatemailprivacydecentralized
Honorable mention
Linux/Windows-friendly email gateway bundling anti-spam and anti-virus layers for existing mail servers.
emailspamgatewaymail
Also strong
E-mail, subdomain, and host harvesting from search engines, PGP servers, and common OSINT APIs.
pentestosintreconemail
Honorable mention
Self-hosted help desk and shared mailbox (Help Scout style).
helpdeskemail
Top pick
Single-binary newsletter and mailing list manager.
emailnewsletter
Honorable mention
Groupware server for calendars, contacts, and email integration.
groupwarecaldavemail