Postage optimization / sorting at the post office

You may discover small digits or number combinations in your mailings, often located above the sender address. These are used to identify and sort the items at the post office for postage optimization.

If you discover various other symbols such as rhombuses or squares on your printed mailings or already on your proof PDF, this also corresponds to a certain process. In this case, these symbols are used by the print service provider to ensure that postal sorting according to postage optimization can be adhered to in the first place - this is a regulation for dialog mail.

The symbols are necessary and we have no influence on them.

Quality control at our printer network

Often there are also small numbers on mailings, usually in the margin where the recipient does not notice them. This serves the quality assurance of the print service provider and is also a regulation.

Since both postage optimization and quality control take place after printing, the digits and symbols are always printed in both scenarios. However, this does not detract from the performance of the mailing.