Tokens not getting mailed

I find that, after a while, we stop getting tokens sent for 
confirm/consult, though they are established and viewable by web.

At the same time, our logs show:

Unable to close file 
/home/majordomo/lists/groups.queernet.org/GLOBAL/_log: File too large at 
/usr/local/majordomo/lib/Mj/Log.pm line 407
        Log::In::abort('Log::In=HASH(0x8839704)', 'Unable to close file 
/home/majordomo/lists/groups.queernet.or...') called at 
/usr/local/majordomo/lib/Mj/Inform.pm line 97
        Mj::Inform::inform('Majordomo=HASH(0x867d410)', 'fgs', 'owner', 
'Mj::Addr=HASH(0x870c710)', 'Mj::Addr=HASH(0x870c710)', '(message to 
fgs-owner)', 'owner', 1, 0, ...) called at 
/usr/local/majordomo/lib/Majordomo.pm line 754
        Majordomo::dispatch('Majordomo=HASH(0x867d410)', 
'HASH(0x8121904)') called at /usr/local/majordomo/bin/mj_queuerun line 511
        main::forward_to_owner('Majordomo=HASH(0x867d410)', 'fgs', '') 
called at /usr/local/majordomo/bin/mj_queuerun line 446
        main::run_queue() called at /usr/local/majordomo/bin/mj_queuerun 
line 170

# ls -l /home/majordomo/lists/groups.queernet.org/GLOBAL/_log
-rw-rw----  1 postfix  postfix  51761327 Jul  1 08:46 
/home/majordomo/lists/groups.queernet.org/GLOBAL/_log