On 25/09/2007, at 12:46 AM, Micheal Espinola Jr wrote:

> David wrote:
>> Oh, when I go to change my outgoing mail settings in Thunderbird  
>> and I
>> choose SSL, it defaults to 465. I do, however, see equal  
>> references to
>> 465 and 587 as viable SSL ports. I see chatter about TLS vs SSL, and
>> STARTTLS being used for port 587, but it's semi-greek to me.  
>> Either way,
>> port forwarding can hopefully handle whichever port ASSP doesn't  
>> bind to.
>
> As far as I understand it in layman's terms: 465 is for MTA to MTA
> (server to server) , and 587 is for MUA to MTA (client to server) mail
> submissions.
>
> I try to keep track of specifications as a reference as to why certain
> settings should be a certain way - but Im a bit behind on my complete
> reading of these texts - so my interpretation might be a bit off.

This sounds right from the little I've read on the subject Micheal.  
But I think you still need 465 for MUA to MTA if the MUA is an old  
version of Outlook. From the Postfix mailing list:

> On Thu, Sep 20, 2007 at 10:22:57PM +0200, Frank Gruellich wrote:
>
>
>> To provide our mail service to these networks we thought about doing
>> some ugly VPN tricks, we thought about more ugly web mailers... but I
>> would like the much simpler way to accept SMTP via SSL at 465 in the
>> hope, that neither open servers nor infected boxes offer encrypted  
>> spam
>> relay.
>>
>
> 465 is the obsolete SSL wrapper mode supported by older Outlook  
> clients.
> The standard submission service is port 587 with STARTTLS.
>
>
>> So what's your experience, is this a port that is treated same
>> as port 25 or is there in general a better chance for this?
>>
>
> Use 587, but offer 465 to ancient clients can't to STARTTLS on 587.
>
> -- 
>       Viktor





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