Periodical Supplements No Longer Need Endorsement

The USPS has announced via Postal Mail Bulletin that periodical supplements no longer need endorsement:

In response to customer needs, effective May 31, 2012, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®) 707.3.3.5 to modify the marking standards for supplements to bound publications. Supplements pre­pared with bound publications that are enclosed in a com­plete wrapper, polybag, or envelope may be mailed without the endorsement "Supplement to..." followed either by the title of the publication, the name of the publisher, or by "Periodicals Publication." This change will unify bound and unbound supplement endorsement requirements and sim­plify preparation of preprinted advertising in bound publi­cations. Here is a link to the revised DMM standard 707.3.3.5.