Glossary
SMTP authentication, also known as SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) that adds a layer of security to email sending. SMTP is used alongside email APIs to send emails. SMTP authentication works by requiring the email sender to log in using a supported authentication method. Then, the mail server sends the email message after the sender has successfully logged in.
Set up appropriate SMTP authentication protocols to improve both email security and deliverability and protect your server from being exploited by spammers.
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