There are several factors that can influence the cost of an email marketing campaign. These include the actual size of the email list, the email platform that the company uses, and even the division of email marketing labor. Having enough staff to create email marketing content is most relevant for companies that want to create their own in-house messaging. While your business’s email marketing factors can be different from other companies, a small or medium-sized small business can expect to pay a monthly email marketing rate between $500 and $2,000.