A custom sticker printer sent a pro-Trump mass SMS and enraged its clients. Sticker Mule, a popular custom sticker printing company, also sent out an email in support of former President Donald Trump.

Sticker Mule, a printing company known for novelty T-shirts and coasters, was not, until recently, a political animal. But at an event on Monday night in Amsterdam, N.Y., three hours north of ...

Sticker Mule occupies the same building that was part of Noteworthy, a family-owned printing company that was once a major employer and property owner but cut back significantly in recent years ...