Removing files in /tmp

[gee_fin]

My /tmp folder was in 100% use (Wordpress falling over eventually), just having a scan through there as previously I've let it be. The majority of files are -

-rw------- 1 popuser popuser 5412 Feb 10 06:57 .spamassassin13860emAxgatmp
-rw------- 1 popuser popuser 5392 Feb 13 18:24 .spamassassin27823bSDERMtmp
-rw------- 1 popuser popuser 5386 Feb 14 18:15 .spamassassin27685W2vB62tmp
-rw------- 1 popuser popuser 5230 Feb 8 21:41 .spamassassin4790UueRRKtmp
-rw------- 1 popuser popuser 5099

ie. these .spamassassinxxxx files. Are these okay to clear out or does the size or temp need to be increased?

Cheers,
Graeme.