Haraka (software) Haraka is an open source SMTP server . Its architecture is plugin-oriented and event-driven. The server and its plugins are written in JavaScript using the Node.js framework .SMTP core and providing developers hooks into the mail flow. Almost all of Haraka's functionality is built as plugins.V8 JavaScript engine and asynchronous I/O , the author claims the server is capable of handling thousands of messages per second .handle 2 to 5 thousand simultaneous SMTP connections with Haraka.Typical Usage Haraka is frequently used as a filtering MTA in front of other MTAs that lack the performance and/or filtering capabilities of Haraka. Craigslist uses Haraka to handle inbound and then forward validated connections to Postfix. Bounce.io similarly uses Haraka to accept incoming messages and deliver them to their application engine. Mail Toaster 6 uses Haraka similarly to accept incoming mail and forward to a qmail based message store.Features SMTP Authentication via LDAP, vpopmaild, flat_file, or SMTP proxy . Access control by domain, IP, sender, or recipient. Bounce validation, optionally blocking forged or invalid bounces. Virus filtering with ClamAV and AVG ASN lookups and filtering Forward Confirmed reverse DNS validation GeoIP reporting and optional filtering Detection of remote Operating System Header validation: make sure required headers are present, singular headers are not duplicated, and values are credible. URIBL lookups of senders IP, helo hostname, envelope sender , and message contents DKIM validation and signing DNSBL support Early talker detection HELO hostname validation Karma, a heuristics scoring engine that weighs the results of all plugins and smites or blesses each connection. Messagesniffer Rate limiting , by host, sender, or recipient Recipient validation in flat file , LDAP, Redis, or qmail-deliverabled. SpamAssassin, via spamd. SPF TLS / SSL Overload detection and automatic deferral of new connections.
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