Hello, with postfix 2.9.6-2 I'm using smtp_tls_security_level = may. No problems with it, but sending mails to some Exchange servers I see this error: *lost connection with mail.domain.com <http://mail.domain.com>[...] while sending MAIL FROM*
If I try to send a mail from bash using: openssl s_client -starttls smtp -connect mail.domain.com:25 -crlf I see: *...* *New, TLSv1/SSLv3, Cipher is DES-CBC3-SHA* *Server public key is 1024 bit* *Secure Renegotiation IS NOT supported* *...* *helo..* *mail from..* and I get disconnected with: *140371681683112:error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number:s3_pkt.c:337:* If I try with *openssl s_client -starttls smtp -connect mail.domain.com:25 <http://mail.domain.com:25> -crlf -no_tls1* It works correctly. Could you help me with the problem? If it happens just with some Exchange servers it seems a problem of their servers.. but is there some way to avoid it? Is there a way to tell postfix to avoid tls1 if delivery fails? Thanks! Andrea
