Related Clues:

• Makes joyful
• Makes really happy
• PC in-box fill
• Makes very happy
• Sends via the USPS
• Sends by truck
• Sends with a click
• Makes ecstatic
• Thrills to pieces
• Inbox contents
• Where holiday delays are common, with "the"
• Inbox buildup
• Suffuses with joy
• Ocean vessels
• Hits 'send' on