7 E-mail Subject Line Best Practices to Avoid the Spam and Trash Folders

2. Avoid symbols like dollar signs and exclamation points
Symbols can cause confusion in a subject line, and some recipients may flag the e-mail as spam. Plus, some symbols and special characters may not display properly on all devices or e-mail providers.

In addition, avoid using all caps as well. Using all caps is the equivalent of shouting online, and no one really wants to be shouted at no matter how important the cause. Avoid using all caps in the body of the e-mail as well.