[CentOS] error in maillog

hi to all,

i trying to telnet my mailserver telnet support.example.com 25 the output like this: 250-support.example.com 250-PIPELINING 250-SIZE 10240000 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250 8BITMIME starttls 220 Ready to start TLS

when i try to quit/exit error i can see in the log like this:

Jul 5 15:42:02 support postfix/smtpd[950]: SSL_accept error from support.example.com[127.0.0.1]: -1 Jul 5 15:42:02 support postfix/smtpd[950]: warning: TLS library problem: 950:error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol:s23_srvr.c:589:

can you help me,thank to all

- d e nn i s -