(keitai-l) spam on au

hi everyone,

yet another mail on spam... ;) until this weekend i had never received 
spam on my au phone (apart from c-mails), but since saturday i've been 
getting around 40 junk emails a day. mostly the same stuff though, so i 
was wondering if there is a way to blacklist email addresses and if that 
will happen on server side or not etc. (the manual is thick and in 
japanese so felt like asking here). using an old a5302ca.

thanks a lot in advance,

tmk