Related Clues:

• Letters that sound macho?
• 'It's in the post', said he
• No woman is said to be suitable for this post
• Protection borne by Pat?
• The postal system in Motherwell is first-class
• Illness gripping one? This would give body protection
• Christmas cards? Mum has one left
• Protection for old soldier, Irishman retreating
• Miles:millilitres, in which there's one:one correspondence
• Audible testosterone-fuelled letters
• Pkg. for eggs
• Copier-tray size: Abbr
• HP tray size
• A and P, e.g.: Abbr
• Fillers of envs