If the people you email find your messages in their spam folder, work through these checks. Most problems come from the first two.
These records prove your emails really come from you. Without them, Gmail, Yahoo and Microsoft are much more likely to mark your email as spam. See Setting up SPF, DKIM and DMARC.
Send a message to mail-tester.com. It gives your email a score out of 10 and explains what to fix. Aim for 9 or above.
Emails sent by website forms, such as WordPress contact forms and order confirmations, often go to spam because they're sent without logging in to a real mailbox. To fix this:
website@yourdomain.com, rather than the visitor's addressDon't send newsletters or bulk email from your hosting email account. It's limited by our sending limits and can harm your domain's reputation. Use an email marketing service instead and include an unsubscribe link.
Use a free blocklist checker, such as MXToolbox, to check whether your domain is listed. If our server's IP address is listed, open a Technical Support ticket and we'll deal with it.
Ask regular contacts to mark your email as "Not spam" and add you to their contacts. This teaches their email provider to trust your messages.
New domains have no sending history yet, so it can take a few weeks of normal email for providers to trust them fully.