I had previously installed the phplist bounce processing patch on my copy of phplist 2.10.5, because my wonderful web host pairLite does not have the IMAP extension installed. Responding to an ominous email warning of a security problem, I just upgraded to 2.10.8. Fortunately, the file processbounces.php was not changed in the upgrade, so I didn’t need to do anything fancy to reapply the patch. I just sent out an email and bounce processing appears to be working fine.