If you have a Wordpress site and have not been receiving your admin emails, you should start using Mailgun to deliver your email.
Mailgun is the email automation engine trusted by over 10,000 website and application developers for sending, receiving and tracking emails. By taking advantage of Mailgun's powerful email APIs, developers can spend more time building awesome websites and less time fighting with email servers. Mailgun supports all of the most popular languages including PHP, Ruby, Python, C# and Java.
One particularly useful feature of this plugin is that it provides you with a way to send email when the server you are on does not support SMTP or where outbound SMTP is restricted since the plug-in uses the Mailgun HTTP API for sending email by default. All you need to use the plugin is a Mailgun account. Mailgun has a free account that lets you send up to 200 emails per day, which is great for testing. Paid subscriptions are available for increased limits.
It's easy to setup, but use this wpbeginner guide to help you through it.