Seems like your email gateway might be blocking the OoO messages.I tried from different senders and never received the OOO
You definitely should see something in the mailbox.log that indicates whether or not the OoO message was sent. If you aren't seeing anything then I would suggest turning off OoO, save the change, and then try turning it back on. Either that or try on another account.Ok but I should get in mailblox.log and outofoffice tag with "not sent" and how long time the OOO mail will be suspended and is it configurable ?
The timing (ie how long before another message is sent) is configurable through the Admin console only. I believe there might be an (old) RFE to put it on the user level as well.