I have added in the email Configuration-> Receiving email -> Anti-Relaying settings 2 value. 1 with the ip address of the internal email server as "permitted domain" and second the domain name of the internal email domain as "permitted domain".
I get the error 550 Relaying denied (i connect through telnet tcp port 25 from the internal email server) when i try to send the outbound email through meg.
Thanks and kind regards
are you telneting from an exchange server/ is there a load balancer involved? more than likely the ip is getting changed along the way and you put the incorrect ip address in the anti relay list.