matt et6245gmailcom heavy issues hotmail since reject legitim messages spam without reason 50 servers worldwide different subnets nearly impossible 50 servers spamed hotmail since servers accept authenticated smtp clients nearly impossible work daily people run servers exactly like yet spam sorts spewing mail queues ones see smtp accounts weak passwords spammers authenticate users bam server spam source exim substantially limited ratelimit httpwwweximorgeximhtmlcurrentdochtmlspec_htmlch40htmlsectratelimiting use something like warn ratelimit 200 1h per_rcpt strict delay 10s log_message sender sender_address rate sender_rate sender_rate_period excedes limit delayed 10 seconds work well using webmail since messages appear come 127001 find plugin squirrelmail limits max recipients messages sent per day per account works well though matt hotmail make sure reverse dns record servers sending ip record name resolves ip smtp banner greeting lists name also use spf records use ptr option reject mail domains contain option thu 07 aug 2008 235927 0600 ot yahoo deferred