Recalling a message to an address not on our Office 365 system will most likely not work.The recall process can take several minutes, during which time the recipient can see the recall notice in their Inbox and can open and read the message you are attempting to recall.I put the email account on a second computer and will slowly add back the email account to all computers. The last recall failure message was Sunday 12:24am. The message has been moved from the Inbox. If the recipient has the Outlook Inbox open, this notification may prompt them to immediately open the message you are attempting to recall. The constant recall failure from one recipient. The recipient is not logged on to the mail service provider. When you attempt to recall a message, a recall notification appears in the recipient's Inbox and remains there while the recall process is taking place.You can only recall messages that have not been read or moved out of the recipient's Inbox.Open &Export > Other Users Folder > then select the Inbox for whom I am a delegate. Im logged in as myself, I open the other person e-mail in Outlook. I have complete access to e-mail for another person, but if I send a message and try to recall in Outlook the Recall is grayed out. You can switch Outlook to Work Offline, delete the sent message and all the failure messages, then. Some other email service may also support the recall feature, but you need to confirm with Gmail though. You can only recall messages from recipients who are currently logged onto the network and using Outlook. Unable to recall a message in outlook on behalf of someone else. The recall feature requires users to use Exchange Server, as you are not using Exchange, you should not try any message recalls.However, the Recall feature is somewhat limited due to the following reasons: This feature can be useful if you send a message and then you discover errors in the message and want to prevent the recipient from reading it. You can also check the Tell me if recall succeeds or fails for recipient. Choose whether to Delete undread copies of this message or Delete undread copies and replace with a new message. However, this feature is not available in OWA (Outlook Web App). Select the Actions option in the Move section of the Message tab. Outlook allows you to cancel (recall) messages that you have sent to other Outlook users. This is the big one Unless the recipient is using Outlook on their Mobile device with the proper Exchange ActiveSync settings, then the recall will likely.