Email deliverability is one of the most important factors in online marketing. It can make or break your business, so it's worth doing everything you can to optimize your email delivery.
Here are 9 best practices for improving your email deliverability:
1. Have a unique sender address.
2. Use an SMTP server that supports DKIM authentication.
3. Test your email delivery with different ISPs, mobile carriers, and email clients.
4. Get an email forwarding service if you don't have an SMTP server or don't use one regularly.
5. Encrypt your outgoing messages with STARTTLS/DANE (if possible) using Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM). If both SPF and DKIM are used together then the validation will be more accurate because both protocols validate message contents separately from the origin domain name (ODN).
6. Use HTML in subject lines and body text.
7. Check your bounce rate for junk emails.
8. Remove invalid email addresses from the autoresponder list.
9. Use a spam filter to automatically identify and block unwanted messages from reaching recipients' inboxes.