Hi Dear All, I thanks everyone for their input & explanation on this request. So much valuable info you guys exchange through emails. Well done Thanks / Regards > 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. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > Thanks / Regards Prabhpal S. Mavi