Quoting Peter Bowyer <peter@???>:
> On 30/01/07, David <lists@???> wrote:
>>
>> 220 ************0 ****200***0******0000
>
> This is Q 0053 in the FAQ, and covered in more detail at
>
> http://www.debian-administration.org/articles/382
>
> ... which suggest that you need to disable SMTP Fixup in the PIX.
My apologies, the brief searching I did missed this. I'm not a PIX
admin but the person in charge has removed the SMTP fixup 'feature'
and it now works as it should.
I'll consider a move to 587 as well if I notice any other oddities.
Thanks to all who replied (anybody want a blue doorstop?).
David