[CentOS] Lost mail

I did an update yesterday evening, and didn't spot that it had changed 
permissions on my .procmailrc.  Consequently no mail came in after that.  
I've been out most of today, so just got it fixed, but what will have 
happened to the mail for the missing period?  Maillog just shows that 
messages have been passed to procmail.  Procmail won't run if the perms are 
wrong, so where do the messages go?

Anne