![]() ![]() PAM, MySQL, PostgreSQL, SQLite, LDAP, Active Directory(LDAP), Kerberos 5, proxied IMAP auth, getpwent, shadow, SIA, BSDauth, Vpopmail. Uses Cyrus SASL authentication library for support for other mechanisms: Berkeley DB, GDBM, or NDBM (sasldb), PAM, MySQL, PostgreSQL, SQLite, LDAP, Active Directory(LDAP), DCE, Kerberos 4 and 5, proxied IMAP auth, getpwent, shadow, SIA, Courier Authdaemon, httpform, APOP and SASL mechanisms: ANONYMOUS, CRAM-MD5, DIGEST-MD5, SCRAM-SHA-1(-PLUS), SCRAM-SHA-224(-PLUS), SCRAM-SHA-256(-PLUS), SCRAM-SHA-384(-PLUS), SCRAM-SHA-512(-PLUS), EXTERNAL, GSSAPI, LOGIN, NTLM, OTP, PASSDSS, PLAIN, SRP Supports X.509 PKI auth via STARTTLS and EXTERNAL. Managed by Courier authentication library which can use PAM, Userdb, PostgreSQL(beta), MySQL, LDAP, and EXTERNAL. ![]() Also supports X.509 PKI auth via STARTTLS/SSL GSSAPI, CRAM-MD5, DIGEST-MD5, APOP, CLRTXT, LOGIN, PLAIN, LDAP, InternalĪctive Directory (LDAP), CLRTXT, CRAM-MD5, DIGEST-MD5, APOP, GSSAPI, NTLM, MSN, SESSIONID, External Authentication Plug-in. Native Anti Hammer - Brute-force attack protection Proprietary with OSS parts, a community ( Freeware) and 3 paid editions (SMB, Enterprise, Hosting) Proprietary/ SaaS, with open-source parts Proprietary (free version: 5 domains, 5 users, 5 groups) Microsoft Windows servers do not natively implement e-mail, thus Windows-based MTAs have to supply all the necessary aspects of e-mail-related functionality.Įmbedded, Optimized for Email & Groupware ![]() Unix-based MTA software largely acts to enhance or replace the respective system's native MTA. Mail is read either through direct access ( shell login) or mailbox protocols like POP and IMAP. To allow the server to send external emails, an MTA such as Sendmail, Postfix, or Exim is required. A stock Unix-like server already has internal mail more traditional ones also come with a full MTA already part of the standard installation. Unix-based mail servers are built using a number of components because a Unix-style environment is, by default, a toolbox operating system. The comparison of mail servers covers mail transfer agents (MTAs), mail delivery agents, and other computer software that provide e-mail services. ![]()
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