You can write the perfect email, but if it lands in the spam folder nobody will ever read it. Deliverability is the unglamorous side of email marketing, and it's where many small businesses quietly lose sales. The good news: a few straightforward steps put you firmly on the inbox side of the line.

Why emails end up in spam

Inbox providers like Gmail and Outlook are trying to protect their users. They look at signals such as:

• Whether your domain is properly authenticated

• How many people open, click, ignore or delete your emails

• How often your emails are marked as spam

• Whether you're sending to addresses that bounce or don't exist

• Sudden spikes in sending volume from a new domain

In short, they reward senders who look legitimate and send emails people want.

Step 1: Authenticate your domain

Authentication proves your emails really come from you. There are three records to set up in your domain's DNS, and your email platform will give you the exact values:

• SPF lists the services allowed to send email for your domain.

• DKIM adds a digital signature to show the email hasn't been tampered with.

• DMARC tells inbox providers what to do with emails that fail those checks.

Gmail and Yahoo now require authentication from bulk senders, and it helps every sender. If you only do one thing after reading this, do this.

Step 2: Send from your own domain

Sending marketing emails from a free address like a Gmail account looks less trustworthy and often fails authentication. Use an address on your own domain, such as hello@yourbusiness.com, and keep it consistent.

Step 3: Warm up gradually

If you're new to sending, or you're moving to a new platform or domain, don't email your entire list on day one. Start with your most engaged contacts and increase volume steadily over a few weeks. This builds a good reputation before you scale.

Step 4: Keep your list clean

• Never buy email lists. Ever.

• Use double opt-in so only real, interested people join

• Remove addresses that hard bounce

• Regularly remove subscribers who haven't engaged in months

• Make unsubscribing easy. An unsubscribe is far better than a spam complaint.

A smaller list of people who love hearing from you beats a big list of strangers every single time.

Step 5: Write emails people want

Engagement is a deliverability signal. Send useful, relevant emails at a consistent rhythm, write clear subject lines that match the content, and avoid shouty, spammy language. When people open and click, inbox providers notice.

The short version

Authenticate your domain with SPF, DKIM and DMARC, send from your own address, warm up slowly, keep your list clean and send emails worth opening. Want a platform that makes all of this easier? Compare our email marketing reviews.