Related Clues:
- Writing is dense, disturbing and in Post again
- Tend to a failed delivery
- NOW apply the proper postage
- Transmit over
- Deal with a bounced email
- Writing on dense assembly put in The Post again
- Rectify a lost email, say
- Have another go at transmitting
- Send over third note, counter tracking packages
- Post twice
- Deal with an email error message, maybe