Ed W:
> On 13/03/2012 23:50, Wietse Venema wrote:
> > #submission inet n       -       n       -       -       smtpd
> > #  -o syslog_name=postfix/submission
> > #  -o smtpd_tls_security_level=encrypt
> 
> I forget the exact details now, but one mail client, I think it might be 
> an Android or iPhone mail client(?) defaults to using the submission 
> service but without encryption.  The error messages were confusing and 
> unhelpful to the customer and I just recall it took some time to realise 
> that it was the enforced tls requirement that was the problem
> 
> I see no reason to *require* encryption on the submission port (RFC 
> aside).  I think "may" is a more appropriate default?

That's not a problem for me. I don't use the submission service
and rely on input from the real world for this.

        Wietse

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