Postfix attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible enough to not upset existing users. Thus, the outside has a sendmail-ish flavor, but the inside is completely different. Extra features always included: - table lookups using PCRE (Perl-Compatible Regular Expression), SQLite - authenticated SMTP using Dovecot SASL Optional features included using flavors: - authenticated SMTP using Cyrus SASL v2 - table lookups using LDAP, MySQL, PostgreSQL, BerkeleyDB
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