Usually this is caused due to Exim misconfiguration.
Please review the following line and ensure that the configuration is correct.
In your config, you may have the following
route_list = *smtp.mailchannels.net::25 randomize byname
There is no gap between * & smtp
Please update the line to the following
route_list = * smtp.mailchannels.net::25 randomize byname
This change adds a space between the " * " and the first smarthost destination and is necessary to route all or * to the destination(s) you have defined.
actually, the problem is in your dashboard copy/paste shows no gap while its required .. I think you need to update your dashboard for that.
Agreed
Thanks for pointing this out. The fix has now been rolled out.