While there are a multitude of reasons journals decide to publish supplemental material, the USPS suggests taking note of the following mailing guidelines:
- At least 25% of editorial content must be germane to the publication.
- “Supplement to…” does not have to be printed on the cover if mailed together in a package (with a regular journal issue).
- The length and height of a supplement must not exceed those of the host publication except when the host publication and the supplement are contained in an envelope, polybag, or other wrap.
- Pages are included in the advertising percentage calculation for postage.
- If the combined weight of the journal and supplement is over 1.25 lbs., automation discounts will be lost.
- A supplement may take the place of a regular issue if it is numbered rather than labeled as “supplement.”
Last week, Allen Press Publisher Peter Burns discussed the details of printing journal supplements in his Best Practices and Innovative Solutions webinar. This webinar included why publications are publishing supplemental content, the pitfalls of doing so, and different types of guidelines to consider. The above USPS guidelines listed above were also discussed in further detail.
More information on supplements is also available on the USPS website.