On 29 April 2018 at 16:57, Viktor Dukhovni <postfix-us...@dukhovni.org> wrote:
>
>
>> On Apr 29, 2018, at 3:37 AM, Dominic Raferd <domi...@timedicer.co.uk> wrote:
>>
>> This is a genuine and expected sender (VoIP provider). I am less sure
>> about atlas.net.tr, but it is probably genuine and expected by
>> recipient too. Unwanted ones I have not bothered to report here.
>>
>> I don't require encryption on port 25: smtpd_tls_security_level = may
>
> If you have time to look into this further, you need full-packet
> capture PCAP files.
>
> # set -- 192.0.2.1 192.0.2.2 # season to taste
> # filter=; for ip
> do
> [ -n "$filter" ] && filter="$filter or "
> filter="${filter}tcp host $ip"
> done
> # tcpdump -s0 -w /var/tmp/tls.pcap $filter
Thanks Viktor, I will bear this in mind for the future. But even if
(with your help) I could determine exactly what the problem was for
these two senders I think there is zero chance they would be
interested in hearing from me about it.
