WP Mail Booster is the WordPress SMTP plugin used for an efficient email delivery. It is an easy and lightweight plugin which is used to Send Emails, Monitor Emails and also troubleshoot the outgoing Emails easily.
Google reCaptcha is the free service that protects your site from spam and abuse. Google reCaptcha uses modern Risk Analysis techniques to detect the bots. Steps to follow to get your Site Key and Secret Key for Google reCaptcha are as
Mailgun is a third-party reliable online email service that is used to send emails through SMTP on the server. Mailgun provides a set of APIs that allow you to receive, track and store email too.
SendGrid is a cloud-based email delivery service that is used for transactional and marketing email. It also allows tracking email, unsubscribes, bounces, and spam reports.
After Gmail and Outlook, Yahoo is one of the top email providers. To set up Yahoo SMTP with WP Mail Bank provide configuration details like Host: smtp.mail.yahoo.com, Port: 587, Encrypt: TLS.
Office 365 is a Microsoft Office product and to set up Office 365 SMTP with WP Mail Bank you need to provide configuration details like SMTP Host: smtp.office365.com, SMTP Port: 587, Encryption: TLS.
Gmail / Google SMTP is solution for fixing the email delivery issue. It is the standard for sending emails. Unlike PHP mail function, SMTP uses authentication which increases the delivery of the emails.