Implementation report for RFC 3848. ========================= Reported by Alexey Melnikov. RFC 3848 describes a list of WITH parameters that should be generated by various SMTP or LMTP clients/servers. There are no known interoperability issues in respect to features described in RFC 3848 in either generators or parsers of WITH parameters. The following software generates WITH parameters specified in RFC 3848. Text in () shows which values are generated. 1) Postfix MTA since 2007-07-20 (ESMTP*) - reported by Mark Martinec 2) Exim, since version 4.42 (ESTMP*) - reported by Tony Finch 3) Cyrus IMAP (LMTP*) - reported by Ken Murchison 4) Sun Java System Messaging Server 7 Update 3 (all) - reported by Chris Newman, with additional information from Ned Freed 5) Isode M-Switch (ESTMP*) and Isode M-Box (LMTP) - reported by Alexey Melnikov (The first 3 implementations are open source and their code can be independently verified.) The following software parses/interprets WITH parameters specified in RFC 3848: 1) SpamAssassin since 3.0.3 (detects message submission hops) - reported by Tony Finch, source code is publicly available. 2) Msglint (verifies values) - writtend and reported by Chris Newman. Some additional tests from Alexey Melnikov 3) Various Sieve (RFC 5228) scripts that can check Received headers - reported by Alexey Melnikov