This is a great way to significantly expand your visibility. Feature your strategic partner that may offer complementary products or services to your business in your email newsletter and include a link to their website or email sign up. In turn, have your strategic partner feature your business in their email newsletter with a link to sign up for your emails.
Note: don’t just add your strategic partner’s email list into your database. These people have not given you their permission to email them and as a result you may get a high SPAM report which can have a negative effect on your email marketing.