When submitting a postcard, the front of the form factor can be designed however you choose. The back, however, should follow our postcard templates, which leave designated areas blank for Lob to print the sender and recipient addresses. This is also the same for self-mailer templates, where the outside address panels have designated ink-free zones. Learn more about ink-free zones for our form factors.
If you are exporting an image for a printing proof the way you usually would when sending images to traditional printers, then the trim lines should be unticked in your settings to ensure a sizing error does not occur:
Please also note that whether or not you export with “Bleed” will depend on how you built your template. If you already manually added the bleed (e.g. 4.25 x 6.25 artwork), then you should have that unticked as well.
Check out our Design guides for further reference.