When an email provider (like Google, Outlook, etc.) receives a new email, it will check to see if that email seems legitimate. One of the most important things it does during this process is verify if the email has been authenticated. In other words, email providers check if each email was actually sent from the site that it claims it was sent from.
Most of us never see this information in the emails we receive, but our email providers are checking over these details very carefully. And as the spamming industry continues to grow (and get more clever), providers are becoming even more strict about which emails they’ll allow into users’ inboxes. If an email doesn’t pass these checks, then it may end up in the recipient’s spam folder or simply never get delivered at all.
If you trying to decide the best way to improve email deliverability for your WordPress site, WP Mail SMTP provides you with several options called “mailers” to let you choose the specific tool that will help deliver your emails successfully to users’ inboxes. You may already have a preference such as Microsoft or Google but here is a more comprehensive list to choose from.
