Small e-commerce emails going to spam: How to troubleshoot SPF, DKIM, and sending domains step-by-step

When a small shop sends promotional emails and the open rate suddenly drops, or customers say they didn't receive them, many people's first reaction is to change the subject line. In reality, you should first check your sending domain and authentication records. My process is to first receive an email using a test account, check the original email header, and see if SPF, DKIM, and DMARC pass…