Can we Post Bulk Letters with API?

Whether you’re an enterprise level customer sending thousands of transactional documents each month or a small business mailing personalized postcards, our bulk mail process API can help automate and control your physical mailing. Stop worrying about mailing size, recipient roles and tags, or how to make the right document match up with the right envelope – let our experienced team take care of it for you.

Postal or letter APIs, also known as snail mail APIs, provide a way to integrate direct mail processes with CRM systems for sending and tracking letters. They allow for fast printing and delivery of critical documents, reducing the need to keep inventory like paper, stamps, envelopes, labels and staplers stocked, which can be expensive, inefficient and space-consuming.

With a postal address verification API, you can also eliminate the need for permits, minimum volumes and USPS mailpiece design rules – all that’s needed to benefit from bulk postage discounts is an envelope and a list of recipients. That means you can get your messages into the hands of your customers in as few clicks as possible.

The Send in Bulk experience is now the default for new accounts and can be enabled by an administrator on existing ones (released in November 2023). Note that the classic Send in Bulk process document will remain available until it’s retired.