Out-of-office replies not being received

[Zero]

All the emails we send to are for B2B. There are no gmail/hotmail type accounts.

I've looked in bounce@domain.com, sentfrom@domain.com, replyto@domain.com and spam folders. None are showing out-of-office or other auto-replies.

Is there a setting where these could be blocked?

 

[twisted1919]

If there's no email in none of the boxes, there's a real possibility those boxes never actually received the emails.