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Whether it is a blog or an ecommerce portal, all websites send email in one form or the other. When a user comments on your post and you have chosen to be notified over the email about the event, you should receive an email when any comment is posted. For an ecommerce portal say using WooCommerce, your prospects and customers need to receive emails at so many points starting with adding an item to the cart.
“Proprietary systems such as Microsoft Exchange and IBM Notes and webmail systems such as Outlook.com, Gmail and Yahoo! Mail may use non-standard protocols internally, but all use SMTP (Simple Mail Transfer Protocol) when sending to or receiving email from outside their own systems.”
It may be that you are not interested in knowing the nitty-gritty of mail server and intend to go for paid programs like Elite by WP Mail SMTP that comes with White Glove Setup:
Still, “it’s smart to have a basic grasp of how mail servers work”:
As per Calista Ikeme, affiliate manager at WPForms, while announcing the launch of WP Mail SMTP Pro, “We realize WordPress users sometimes, almost always, struggle with email deliverability. We want to fix that. And we think we’ve come up with a pretty great solution!”
“You can send emails using your own (or third party) SMTP email server, Google, Mailgun, SendGrid, Amazon SES, Office 365, or Outlook.com – so you will need to have one of those accounts to complete setup of the WP Mail SMTP plugin.” Do refer Common Questions that make it clear that this WordPress plugin will not work on WordPress.com platform: