There is no upper cap on the size of the attachment, but sending huge
files as an attachment is a not a good practice.Do not attach the video
itself to the delivery as the email may become very heavy weighted and
could be rejected or blocked either by ESPs or recipients.Large sized
emails, which would be the result of embedding a video, would greatly
reduce the deliverability. Additionally, emails with videos embedded in
them are generally handled by all ISPs as SPAM due to the infrequency of
th...