Which suggests that your end (on an RFC1918 IP address of 172.17.25.35)
is behind a NAT firewall, which could part of the problem.  The
SMTP server however does not seem to be reachable from Internet at
large, so the networking topology here is unclear.

On 09.10.17 12:35, Florian Coulmier wrote:
Indeed, only our servers are able to reach this MX. This is the normal behavior.

then it shouldn't be an MX... maybe you mean in-path mail server?


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