I have some exim servers (running 4.68) which are acting as SMTP antispam/virus
gateways for internal SMTP servers.
For the moment I am using recipient callouts to look if recipients addresses exist.
I have no control on some internal servers due to some policies. Some of these
servers have lower message_size_limit than the gateways, causing mails to be
bounced after being fully received.
Is there a way to do some kind of callout for SIZE on the internal servers as
well? I suppose callouts do an EHLO which would return in the answer the value
of SIZE.
