We've sended a big email batch from our test-environment for a bulk test; but there went something wrong on the receiving side. 

Is there a way to resend these emails? All email content is available in the email log. 

(There are some old threads on this forum, without any answer)

Clear the sent column from ossys_email_status?

I cleared the Sent column (set to NULL) and set the next_run to getdate(), with this statement:

set sent = null
,next_run = getdate()
where id in
( ... )

The status changed from 'sent' to 'pending', and back to 'sent', but i didn't receive the emails.

Did you try restarting the scheduler service after the udpate?