Re: How to define another Port for sending SMTP?

In article <mpro.r19sfl01cyhas0346.lists@...> Steve Fryatt
wrote:

> On 20 Oct, Mik Towse wrote in message
>     <597E4B3683%mik.towse@...>:
> > I used to use Port 465, but it's deprecated for secure SMTP and no longer
> > an accepted standard for SMTP.
> > 
> > Port 587 is the preferred port for secure SMTP and is the one recommended
> > for mail submissions instead of port 25.
> Are you sure about that?
Well, I thought I was. ;)

> In my experience, port 465 is still in common usage as "fully encrpted"
> (STMP using SSL), to differentiate it from "opportunistic encryption" on
> port 587 (using STARTTLS).
AIUI port 465 was originally registered for SMTPS (SMTP over SSL). After a
brief stint in that function, port 465 was reassigned for a different use and
deprecated. Despite this, many ISPs and cloud hosting providers still support
port 465 for SMTP submission.

> I don't know what versions of secure SMTP M-Pro IMAP supports, but it's
> important to realise that the different ports will have different
> expectations as to what they will receive from the client. If port 465 is
> expecting SSL connections, then it's no use trying to use it with STARTTLS;
> likewise port 587 and SSL.
These days 587 should be considered the default, especially as it supports
TLS.

-- 
Mik Towse * mik.towse@... * http://www.xemik.co.uk/
My writers' site can be found at: http://www.lexis.org.uk

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Reality is an obstacle to hallucination

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