Relevant products: Exclaimer Cloud - Signatures for Office 365, Signature Manager Outlook Edition, Signature Manager Office 365 Edition
When sending an email in Outlook there is a delay for the message to be sent, or Outlook becomes unresponsive.
The delay can occur when Outlook tries to send an email which contains web hosted images. The delay is typically caused by Outlook downloading and embedding the image as it sends. Typically this does not result in a visible delay but if the images are particularly large or the internet connection is slow, then this process can take several seconds or even cause outlook to enter an unresponsive state.
The use of embedded images is recommended for client-side signatures in order to prevent this delay.