Hermes Secure Email Gateway vs Spamihilator

Hermes Secure Email Gateway is a self-hosted Docker Compose stack for email security, mail hosting, encryption, and collaboration. It can sit in front of Microsoft 365, Google Workspace, Exchange, or Postfix, run as a full mail server, or combine those roles in a hybrid setup. Incoming mail passes through Postfix postscreen and RBL checks, followed by scanning orchestrated by Amavisd-new with SpamAssassin and ClamAV. Hermes checks SPF, signs and verifies DKIM, enforces and aggregates DMARC, and signs and verifies ARC. Encryption options include SMTP TLS, S/MIME, PGP, encrypted PDF fallback, and Dovecot mail-crypt at rest. Full-server mode adds Dovecot mailboxes, IMAPS, POP3S, Submission, LMTP, quotas, shared mailboxes, and Sieve rules. Bundled Nextcloud supplies file sync, webmail, calendars, and contacts; Authelia provides single sign-on and multi-factor options. The free Community Edition is open source. Pro costs $750.00 per year per server and has a free 30-day trial. Hermes requires a Linux host with Docker Engine 24.0 or later and Docker Compose v2.

Spamihilator is a free Windows program positioned between an email client and the Internet to filter incoming unsolicited mail. Its Learning Filter uses Bayesian filtering, and the site says it recognizes more than 98% of spam mails. Built-in Spam Word, Link, DCC, and Rule filters can be supplemented with custom words and regular expressions. The program works with POP3 and IMAP clients, including Outlook and Mozilla Thunderbird, and uses SSL/TLS when supported by the mail server. Recognized spam is held in a Recycle Bin for restoration, and users can train the filter with spam and non-spam messages. An option can delete messages from blocked senders directly on the server before download. Plugins and add-ons can extend filtering or add functions, including DNS blacklist and SpamAssassin-header examples. The download page lists version 1.7 dated June 5, 2022, in 32-bit, 64-bit, and portable builds; not all plugins work with 64-bit. English and German are included, with a language pack adding over 30 languages.