Release Notes: This release adds an option to deal with broken MTAs that are unable to implement a simple protocol: allow_space_after_colon_for_MAIL_and_RCPT allows a space after the colon in the MAIL and RCPT commands.
Release Notes: This release adds features to deal with TLS interoperability problems.
Release Notes: This version enhances handling of failures of processes that are under control of mcp and adds cert pinning as an experimental feature.
Release Notes: This release fixed a stack alignment problem for *BSD based OSs in statethreads, which caused crashes when compiled against a recent OpenSSL version which uses asm code for SHA functions. It also introduced an incompatible change for the lookup algorithm in maps for IP addresses, fixed a "dot-stuffing" bug in contrib/femail.c, and added some more TLS and IPv6 related enhancements.
Release Notes: This release relaxes the requirement for successful DNS lookups and adds several more STARTTLS-related features.
Release Notes: This release works on Darwin 12 and adds more TLS enhancements.