Hi Clare,

As I understood, while you’re sending emails in Outlook, they’re are not getting sent to the recipient and stuck in Outbox. The possible reason to this problem can be one of the following: If the attachment are too large in size, Can’t connect to the mail server, Incorrect login information, corrupted SRS files, etc. In your case, I think the problem is occurring due large size of attachment (since you’ve attached videos in the email).

Solution:
In this situation, you need to delete the attachment that are restricting you to send the email otherwise to send the attachments to the recipient anyhow, you need to firstly upload the attachments over the network. After attachments are uploaded, a URL will be generated, you need to give that URL to the recipient whom you want to send the attachments.

Thanks and Regards,
Anjlua