Heavily-backed e-mail marketer StrongMail Systems has made another acquisition. The startup has picked up e-mail marketing consulting firm The Email Advisor, which focuses on providing advice to businesses that want to bolster their e-mail marketing programs. In a release, StrongMail says that the firm will boost its own growing “strategic services” business. The purchase follows StrongMail’s acquisition in late June of social media marketing firm PopularMedia. Sequoia Capital-backed StrongMail has raised more than $35 million in funding, including $7.6 million in a round in July.