Am 31.03.2012 13:36, schrieb Jonathan Vomacka: > On 3/31/2012 7:11 AM, Prabhpal S. Mavi wrote: >> But when i telnet 587, i can see 220 in response. >> [root at jet postfix]# telnet localhost 587 >> Trying ::1... >> Connected to localhost. >> Escape character is '^]'. >> 220 mail.digital-infotech.com ESMTP Postfix (2.6.6) >> >> But when i telnet to 465, i do not see 220 in response. is it normal? >> [root at jet postfix]# telnet localhost 465 >> Trying ::1... >> Connected to localhost. >> Escape character is '^]'. Expected behaviour. Bear in mind that 465 is the old deprecated SMTPS (SMTP over SSL) port which just runs SMTP over an SSL session. Postfix cannot send a greeting on that port without completing the SSL handshake first, but Telnet doesn't speak SSL. So Postfix is just waiting in vain for the SSL handshake. > I thought port 465 SSL was deprecated Correct. > and replaced with port 587 TLS? Not quite. It's replaced with STARTTLS which works over port 25 (SMTP) as well as 587 (MSP). HTH T.