Ok, after virtually years of trying to raise max spam size, I am finally posting it as a bug. I've simply ceased to believe that this is possible with the current setup of directadmin at all (probably hardcoded somewhere).

Present state of affairs:

- I am using exim.conf 4.54
- I am following instructions posted here: http://forum.directadmin.com/showthr...051#post263051

My own last thread, with kind help by zEitEr, but leading nowhere: http://forum.directadmin.com/showthread.php?t=54688

My variables.conf.custom:
Note that some mails that are higher than the 500k default threshold do receive imap spam flags and end up in my spam folder now, but I believe this is accomplished by my mail client (Thunderbird). What I can tell for sure is that these mails don't have any X-Spam headers, so I guess it's safe to assume that Spamassassin never sees them.