Mails not sent

The very first mail sent on signup is sent.

Delayed mails are not sent

There is no logs/cron_info.txt - which maybe indicates cronjobs are not running...

Only: logs/cron_info.txt & subscribe-unsubscribe.log & mysqli-errors.log

Cronjobs are set up running every hour

Had 2 responders earlier that worked.

Sending smtp test mail works

Any ideas?