Related Clues:

• Contact option
• WikiLeaks source, perhaps
• Something checked on a phone
• Office chore
• One usually has a subject line
• Web message
• A lot of it is spam
• Correspondence making half of them sicken
• Medium for modern marketing campaigns
• Not-entirely-secure method of sending documents
• Messages in echo Irishman sent up
• I am upset to be included in the Spanish messages online
• You might be copied on one
• One may have an attachment to picking up William Blake's last letter?
• What a pointless meeting probably should have been handled by