On 16/6/2022 8:16 pm, Viktor Dukhovni wrote:
So it is far from clear what you could do to make this client happy.
Perhaps some security middlebox near the client is misbehaving, or its
TLS stack is broken beyond repair. Your best may be to disable STARTTLS
for connections from this client:
smtpd_discard_ehlo_keyword_address_maps =
inline:{ { 216.109.104.12 = starttls } }
If possible, reach out to the postmaster of the remote system or ask the
receiving user for their contacts on the sending side. They may have some
insight about what it is their software is unhappy about.
Thank you very much for taking the time to look into this issue with so
much detail. I do appreciate it very very very much.
I will do the smtpd_discard_ehlo_keyword_address_maps to not advertise
starttls.
I am suspecting it is their java something that has the problem.
When I did communicate with their support, she said this a cloud
solution and it cannot be their problem. They are big. I think they are
some SAP company.
Anyway we can conclude that it is not our server. That's a relief.
Once again thank you very much for helping.
P.V.Anthony
