[nowwhat]

There seems to be either a DOS attack or Trojan somewhere on the network as it is now preventing us from sending emails as it has blocked our IP and all the ones on this network.

a) don't post here, but open a ticket.
b) when opening a ticket, be more specific. Stating the OVH network has been Trojanised is .... well .... ( ). Hundreds of thousands of servers are up and running ( https://www.ovh.com/fr/support/status/ ) so it moust be only yours who has troubles.

[iywuk]

There seems to be either a DOS attack or Trojan somewhere on the network as it is now preventing us from sending emails as it has blocked our IP and all the ones on this network.

How can this be resolved quickly.

Mike