Oliver's Divine Delivery Theory is put to the test when he and the POstables seem to be unable to deliver a damaged letter from a military veteran that's a matter of life and death.
You can now watch Signed, Sealed, Delivered: Lost Without You online on the following streaming providers in the United States.
| Directing | Kevin Fair | Director |
| Sound | Paul Novokshonoff | Boom Operator |
| Camera | Tegan Kolodinski | First Assistant Camera |
| Costume & Make-Up | Rosa Terracciano | Key Hair Stylist |
| Writing | Martha Williamson | Writer |
| Writing | Brandi Harkonen | Story |
| Editing | Tony Dean Smith | Editor |
| Directing | Matthew Blecha | First Assistant Director |
| Sound | Greg Stewart | Sound Re-Recording Mixer |
| Camera | Tyler Walzak | Camera Operator |
| Crew | Darcy Davis | Special Effects Coordinator |
| Visual Effects | Tyler Mirecki | Visual Effects Coordinator |
| Crew | Brett Armstrong | Stunt Coordinator |
| Camera | Robert Siuda | First Assistant Camera |
| Art | Kayla Mackey | Art Direction |
| Lighting | William McKnight | Gaffer |
| Camera | Duane Prentice | Still Photographer |
| Sound | Roger Morris | Dialogue Editor |
| Directing | Holly Atchison | Script Supervisor |
| Costume & Make-Up | Valerie Halverson | Costume Design |
| Camera | Ty Klassen | Dolly Grip |
| Production | Yale Kussin | Production Coordinator |
| Directing | Jojo Lau | Script Coordinator |
| Camera | Catherine Mallette | Camera Operator |
| Crew | Jason Macintyre | Post Production Supervisor |
| Production | Harvey Kahn | Producer |
| Camera | Adam Sliwinski | Director of Photography |
| Production | Michael Farias | Location Manager |
| Visual Effects | Barry Liu | Visual Effects Supervisor |
| Editing | Saeed Vahidi | Assistant Editor |
| Art | Laurin Kelsey | Property Master |
| Lighting | Bryn McCashin | Best Boy Electric |
| Camera | Mark H.W. Park | Key Grip |
| Camera | Ryan Plummer | Still Photographer |
| Art | Sean Kirkby | Production Design |
| Art | Jacqueline Miller | Set Decoration |
| Costume & Make-Up | Erin Mackenzie | Key Makeup Artist |
| Sound | Jeff Jackman | Sound Designer |
| Production | Jackie Lind | Casting |
| Production | Shana Landsburg | Casting |
| Sound | James Jandrisch | Music |
| Production | Allen Lewis | Supervising Producer |
| Production | Matthew Blecha | Supervising Producer |
| Production | Marcie Gold | Co-Executive Producer |
| Production | Brandi Harkonen | Co-Executive Producer |
| Production | Joel S. Rice | Executive Producer |
| Production | Kevin Fair | Executive Producer |
| Production | Michael Prupas | Executive Producer |
| Production | Martha Williamson | Executive Producer |
| Crew | Bruce Crawford | Stunt Double |
| Production | Allen Lewis | Production Manager |
| Directing | Annabelle Wilczur | Second Assistant Director |
| Production | Steve Kinghorn | Assistant Location Manager |
| Camera | Molly Mackinnon | Second Assistant Camera |
| Camera | Kyle Douglas Murray | Second Assistant Camera |
| Camera | Sean Roche | Camera Trainee |
| Camera | Lyndsay Gresl | Camera Trainee |
| Sound | Sebastian Salm | Sound Mixer |
| Crew | Bridget Beall | Craft Service |
| Crew | Melissa Muller | Craft Service |
| Art | Mykhila Drummond | Assistant Art Director |
| Art | Jonathan Peter Fill | Set Dresser |
| Art | Ali Tavasoli | Lead Set Dresser |
| Art | Jessica Campbell | Assistant Property Master |
| Art | Malika Montague | Assistant Property Master |
| Art | Lila McKinlay | Props |
| Art | Charles Ouelette Pelletier | Props |
| Costume & Make-Up | Stephanie Janyk | Assistant Costume Designer |
| Costume & Make-Up | Desire Egan | Assistant Costume Designer |
| Costume & Make-Up | Michelle McDonald | Costume Set Supervisor |
| Costume & Make-Up | Amy-Leigh Poitras | Assistant Makeup Artist |
| Costume & Make-Up | Lilia Afsahi | Assistant Hairstylist |
| Crew | Randy Rohrback | Generator Operator |
| Camera | Sean Rooney | Best Boy Grip |
| Production | Laura Obenaus | Assistant Production Coordinator |
| Production | Adrian Bojidar | Assistant Production Coordinator |
| Production | Chase Brettoner | Assistant Production Coordinator |
| Directing | Lee Karlovic | Third Assistant Director |
| Production | Doreen Davis | Production Accountant |
| Production | Jennifer Lloyd | Payroll Accountant |
| Crew | Dean Fitzpatrick | Transportation Coordinator |
| Crew | Tsering Rongae | Transportation Captain |
| Production | Sara Brown | Background Casting Director |
| Crew | Ian Doig | Animal Wrangler |
| Editing | Eugen Mihalicka | Assistant Editor |
| Production | Sepideh Merchant | Post Production Coordinator |
| Editing | Kipp Lightburn | Online Editor |
| Sound | Jeff Jackman | Sound Re-Recording Mixer |
| Sound | Rick Senechal | Foley Recording Engineer |
| Sound | Don Harrison | Foley Artist |
| Sound | Ian Mackie | Foley Artist |
| Sound | Valerie Biggin | Music Supervisor |
