[CentOS] SMTP Port 465 - Postfix

Prabhpal S. Mavi prabhpal at digital-infotech.net
Sat Mar 31 10:25:26 EDT 2012


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.
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Thanks / Regards
Prabhpal S. Mavi





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