cronjob processed, but no mail sent

Hi,

For some reason my cronjob is not working anymore.
I've not made any changes (as far as I know).

The automated e-mails I received mention "cronjob processed", but in the backend the e-mails are still mentioned as pending.

the command I use is:
/usr/local/bin/php /home/XXXXX/public_html/components/com_easysocial/cron.php

My host doesn't use wget.
Do you have any idea what the issue might be?

Thanks in advance.