You can leave packages in your mailbox for the mailman to take as long as you have prepaid postage labels on the packages and the package fits in the mailbox.
After leaving the package in the mailbox you should be sure to put the flag up which indicates to the mailman that you have outgoing mail for them to pick up.
As long as the package has proper postage the mailman will take it and deliver it back to the post office to be sorted.
If it has the proper postage it will then be sent out to a sorting facility and delivered to the address you have it on.
You can also schedule pickups for packages at USPS website so that they know that you have outgoing packages for them.
You can mail any package including a small package from your house after weighing the package and printing a prepaid shipping label.
Once you've printed a prepaid shipping label and paid for postage you can place the small package in your mailbox for pickup.
Just make sure the postage is the correct postage with the label and leave the small package in your mailbox.
The USPS postal delivery worker will pick the package up and scan it into their system and take it back to the post office for sorting.
You can also mail larger packages from your house after paying for postage and and affixing the prepaid shipping label.
As long as it has the correct postage the package can be shipped from home.
You can also in some locations have UPS and FedEx pick up prepaid postage packages from your house or business if they come by the area.
Or you can drop off prepaid UPS or FedEx packages at drop off locations including Dollar General.
You can use the USPS website to pay for and create a shipping label, pay for postage and schedule a pickup.
You'll also need a postage label printer to print the shipping label and shipping labels that you use with your label printer.