Related Clues:

• Mother, I came first to the post
• Fist in post
• In post in armour
• The old knight got posted here
• In post, in armour
• Sent the letter in armour
• You'd get lame and die if posted this way
• Sent via phone
• Contacted paperlessly
• Clicked off, perhaps
• Posted under protective cover
• Written, in a way
• Used a FedEx Office service
• Like many PDFs
• Sent in a stamped envelope