Mireka - Mail server and SMTP proxy

Mireka is a mail server with SMTP, Mail Submission and POP3 services. It is also an SMTP proxy. As a proxy, it can help to prevent or diagnose mail problems, like outgoing backscatter spam.

• detailed logging
• basic mail traffic statistics
• filtering by DNSBL
• filtering by SPF
• accepting mail only for local domains and recipients
• wildcards (regular expressions) can be used to specify local recipients
• basic tarpit, to prevent e-mail address harvesting
• loop detection
• configurable maximum message size
• easy implementation and installation of custom filters written in Java
• separate Message Transfer Agent and Message Submission Agent ports: 25 and 587 by default
• proxy functionality for incoming mails (both MSA and MTA)
• the proxy can select from more than one backend server, based on the recipient
• standalone (non-proxy) Message Submission Agent implementation with file system based mail queues
• submission port authentication by IP address or by username-password pair through SMTP authentication
• POP3 service for retrieving mail, file system based mail store
• aliases, forward lists and (very) simple mail lists
• Sender Rewriting Scheme (SRS) for SPF compatible forwarding
• secure communication using STARTTLS on all services
• "delayed" DSN reports on temporary failures
• embeddable