The beloved POstables discover a 200-year-old valentine that could change history, while their investigation of a damaged letter leads them to a public figure who could be brought down by its contents. And in the aftermath of Valentine’s Day, Oliver, Shane, Norman and Rita are each dealing with heartbreaking circumstances
You can now watch Signed, Sealed, Delivered: From the Heart online on the following streaming providers in the United States.
| Directing | Lynne Stopkewich | Director |
| Writing | Brandi Harkonen | Writer |
| Crew | Martha Williamson | Creator |
| Writing | Martha Williamson | Teleplay |
| Production | Harvey Kahn | Producer |
| Sound | James Jandrisch | Original Music Composer |
| Sound | Jeff Tymoschuk | Original Music Composer |
| Editing | Tony Dean Smith | Editor |
| Crew | Brett Armstrong | Stunt Coordinator |
| Camera | Adam Sliwinski | Director of Photography |
| Sound | Valerie Biggin | Music Supervisor |
| Production | Jackie Lind | Casting |
| Production | Shana Landsburg | Casting |
| Art | Sean Kirkby | Production Design |
| Production | Allen Lewis | Supervising Producer |
| Production | Marnie Termuende | Supervising Producer |
| Production | Marcie Gold | Co-Executive Producer |
| Production | Brandi Harkonen | Co-Executive Producer |
| Production | Joel S. Rice | Executive Producer |
| Production | Harvey Kahn | Executive Producer |
| Production | Michael Prupas | Executive Producer |
| Production | Martha Williamson | Executive Producer |
| Writing | Martha Williamson | Story |
| Crew | Dan Pelchat | Stunt Driver |
| Crew | Dan Redford | Stunts |
| Production | Allen Lewis | Production Manager |
| Directing | Tim Sereda | First Assistant Director |
| Directing | Eddy Hardy | Second Assistant Director |
| Production | Michael Farias | Location Manager |
| Production | Geoffrey Dodd | Assistant Location Manager |
| Camera | Lindsay George | Camera Operator |
| Camera | Douglas M. Scwartz | Camera Operator |
| Camera | Catherine Mallette | Camera Operator |
| Camera | Christian Cummins | First Assistant Camera |
| Camera | Tegan Kolodinski | First Assistant Camera |
| Camera | Molly Mackinnon | Second Assistant Camera |
| Camera | Dan Funk | Second Assistant Camera |
| Camera | Nicole Thomason | Camera Trainee |
| Camera | Katherine Herndl | Digital Imaging Technician |
| Camera | Bettina Strauss | Still Photographer |
| Sound | Sebastian Salm | Sound Mixer |
| Sound | Paul Novokshonoff | Boom Operator |
| Directing | Matt Babinec | Script Supervisor |
| Crew | Bridget Beall | Craft Service |
| Art | Jonathan Krauth | Art Direction |
| Art | Tamara Gauthier | Set Decoration |
| Art | Ashlee Radu | Assistant Set Decoration |
| Art | Genevieve Phillips | Set Dresser |
| Art | Mark Mcdonald | Property Master |
| Art | Logan Murray | Assistant Property Master |
| Art | Colby Morgan | Props |
| Costume & Make-Up | Valerie Halverson | Costume Designer |
| Costume & Make-Up | Dee Egan | Assistant Costume Designer |
| Costume & Make-Up | Michelle McDonald | Costume Set Supervisor |
| Costume & Make-Up | Erin Mackenzie | Key Makeup Artist |
| Costume & Make-Up | Rosa Terracciano | Key Hair Stylist |
| Costume & Make-Up | Leah Roberts | Assistant Makeup Artist |
| Costume & Make-Up | Jiji Ballard-Cavill | Assistant Hairstylist |
| Lighting | Tyler Walzak | Gaffer |
| Lighting | Poya Reisi | Best Boy Electric |
| Camera | Mark H.W. Park | Key Grip |
| Camera | Ty Klassen | Best Boy Grip |
| Camera | Corey Tremblay | Dolly Grip |
| Crew | Darcy Davis | Special Effects Coordinator |
| Art | Jeff MacIntyre | Construction Coordinator |
| Production | Yale Kussin | Production Coordinator |
| Production | Sam Marshall | Assistant Production Coordinator |
| Directing | Michael Bishop | Third Assistant Director |
| Production | Svatia Sakarova | Accountant |
| Production | Doreen Davis | Production Accountant |
| Production | Wendy Lowe | Payroll Accountant |
| Crew | Dean Fitzpatrick | Transportation Coordinator |
| Crew | Brett Taylor | Transportation Captain |
| Crew | Sean Hanlin | Security Coordinator |
| Production | Kit Hayward | Extras Casting |
| Crew | Jason Macintyre | Post Production Supervisor |
| Editing | Jorelle Miranda | Assistant Editor |
| Editing | Michael Jacobsen | Assistant Editor |
| Production | Sepideh Merchant | Post Production Coordinator |
| Editing | Matthew Shuttleworth | Online Editor |
| Visual Effects | Barry Liu | Visual Effects Supervisor |
| Sound | Ryan Thompson | Sound Re-Recording Mixer |
| Sound | Greg Stewart | Sound Re-Recording Mixer |
| Sound | Roger Morris | Dialogue Editor |
| Sound | Jeff Jackman | Sound Designer |
| Sound | Angelo Nicoloyannis | Sound Editor |
| Sound | Rick Senechal | Sound Engineer |
| Sound | Don Harrison | Foley Artist |
| Sound | Ian Mackie | Foley Artist |
| Sound | Sean Szutka | Assistant Sound Editor |