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Are you having problems receiving email from your WordPress site? For example, contact form submissions, or notifications from your eCommerce plugin? This is very common. The following article explains why this happens, why it particularly effects customers, and how you can fix it. If you’re not receiving WordPress emails, read on.

First, a quick check: Ensure you are testing it with a legit email address and check your SPAM folder.

Ok, checked that, but it’s still happening… please explain?

Ok, checked that, but it’s still happening… please explain?
Sure! Let me explain. WordPress sends email using PHPs mail() function, which means that emails from your website appear (to other mail servers) to come from a computer, not a person. Thus, they are often marked as SPAM, or rejected entirely by the recipient mail server. Fortunately this problem can be resolved by configuring WordPress to send systems generated emails over SMTP instead of mail()

Refer:

Easy WordPress SMTP – Send Emails From Your WordPress Site Using a SMTP Server


https://www.inmotionhosting.com/support/website/wordpress/install-setup-smtp
http://www.wpbeginner.com/plugins/how-to-send-email-in-wordpress-using-the-gmail-smtp-server/