What are partnerships?
As it relates to email marketing, partnerships refer to a big range of different mutually beneficial relationships that a business might build with other businesses within their industry. One company that builds websites for real estate agents might, for instance, partner with another company that does SEO for real estate agent websites. By so doing, both businesses benefit from referrals created by the relationship.
Typically, partnerships are mutually beneficial and do not require either party to pay for referrals (that would qualify as paid advertising). However, there might be commission agreements among mutually beneficial business partnerships.