Outlook Express and STARTTLS

Robert Moskowitz rgm at htt-consult.com
Sun Nov 23 00:46:45 UTC 2014

On 11/21/2014 03:38 PM, Gedalya wrote:
> On 11/21/2014 03:32 PM, Robert Moskowitz wrote:
>> On 11/21/2014 03:09 PM, Reindl Harald wrote:
>>> Am 21.11.2014 um 20:59 schrieb Robert Moskowitz:
>>>> I have one user that uses Outlook Express.   Not only do I not use 
>>>> it, I
>>>> don't have any systems here that can easily use it.  I bit of a 
>>>> challenge.
>>>> I am strictly enforcing STARTTLS or TLS for SMTP/POP3/IMAP 
>>>> connections.
>>>> SO far a google search has not shown me how to configure this for a
>>>> user.  Anyone have a pointer to instructions so I can talk the person
>>>> through the changes?
>>> it can't as well as Outlook for POP3/IMAP
>>> you need 993/995 *without* STARTTLS - period
>>> and that's why a sane mailserver needs to support 
>>> 110,143,993,995,587 *and* 465 to support every client, that won't 
>>> change in the near future
>> I missed 465; got the rest.  Will have to look THAT one up. Thanks 
>> for the tip, Harald.
> That's just implicit TLS for SMTP submission, instead of 587. OE needs 
> that.
Back to fixing this and first I see that I DID try something because I 
created a firewall rule for 645 instead of 465.  Then I checked over at:


And 465 is not assigned for this purpose.  Looks like a land-grab from 
back in the days.

Anyway, this is most likely a POSTFIX config item, not Dovecot, so I 
will have to check through the docs there to get this set up right.

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