Why your business emails land in spam, and how to fix it

You send a quote, an invoice or a newsletter, and the customer never sees it. It is sitting in their spam folder. Email deliverability problems are common and costly, and they are usually caused by a few technical settings that are easy to fix once you know where to look.

Why emails land in spam

Email providers like Gmail and Outlook decide in a split second whether to trust a message. They look at:

• Whether the sending server is really allowed to send for your domain.
• The reputation of your domain and the servers you send from.
• How recipients react: do they open, reply or mark you as spam?
• The content itself: misleading subject lines, too many links or images, or attachments from unknown senders.

Since 2024, Gmail and Yahoo have required bulk senders to authenticate their emails properly. Messages that fail these checks are increasingly rejected outright.

Set up the three key records

These are small settings in your domain's DNS. Together they prove your emails are really from you.

1. SPF lists the servers that are allowed to send email for your domain, such as your email provider and your newsletter tool.
2. DKIM adds a digital signature to every message, so receivers can check it wasn't changed on the way.
3. DMARC tells receivers what to do when a message fails SPF or DKIM, and sends you reports about who is sending email in your name.

Start DMARC in monitoring mode, review the reports, then tighten it step by step. This also stops scammers from sending fake emails that look like they come from your business.

Use the right tools for each kind of email

• Everyday email from your team should go through a professional provider like Google Workspace or Microsoft 365 at your own domain.
• Website emails like contact form notifications, password resets and order confirmations should be sent through a transactional email service, not the web server's built-in mail function.
• Newsletters belong in a dedicated tool, ideally from a separate subdomain, so a marketing campaign can never hurt the reputation of your invoices.

Keep your reputation healthy

• Only email people who asked to hear from you. Never buy lists.
• Make unsubscribing easy and fast.
• Remove addresses that bounce or haven't opened anything in a long time.
• Send at a steady rhythm instead of sudden huge batches.
• Write clear subject lines that match the content.

Check how you're doing

Free tools like Google Postmaster Tools show your domain's reputation with Gmail, and mail testers show whether SPF, DKIM and DMARC pass. If customers say they didn't get your emails, check these first, before blaming the recipient.