

SMTP (Simple Mail Transfer Protocol) fixes email delivery issues by changing the way your site sends emails and by properly authenticating them. Fixing Email Delivery Issues With WP Mail SMTP One way email providers do this is by checking if the email originates from the same location it claims to be sent from.įor example, if your email server is but your email claims to be sent from your website’s domain, email providers may block your form notification before it even reaches users’ spam folders.

In addition, email providers check each incoming email to determine if they should allow the email to deliver, send it to spam, or block it entirely. This is a simple way of sending email, but many WordPress hosting servers are not configured to use this mail() function. WordPress and WordPress plugins send email using the PHP mail() function by default. There are two main reasons why WordPress emails don’t deliver successfully: server configuration and spam filtering.
