This post is part of a series of guest posts authored by popular bloggers and internet business consultants. Today's guest post is written by Daniela Baker, who helps entrepreneurs at CreditDonkey with evaluating the best credit card for small business.

How to Keep Your Email Campaign Out of the Spam Folder

The spam folder—every email marketer’s worst nightmare. Once your emails are flagged as spam, your campaign metrics plummet, going from a potential success to an…