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"<p>Put simply: it doesn&#8217;t need to connect and communicate through the SMTP protocol with other servers!</p><p>To send your mails via an external SMTP server, your WordPress server must contact the other server. The two servers then start a typical SMTP dialog with about 10 questions and answers (“Who is there?”, “Who is the email going to?” etc.) before exchanging the email. This adds up to a usual requirement requirement of<strong> 700 &#8211; 1,200 milliseconds for each email sent through SMTP</strong>. Therefore, on average, a <strong>WP Mail SMTP plugin can send around <span style=\"text-decoration: underline;\">1 email per second</span></strong>.</p><p>Campation PostOffice&#8217;s <strong>SpeedMail technology easily sends 20+ emails per second</strong>. It uses the MTA (mail transport agent) of your server where communication between WordPress and the MTA only costs microseconds! Or its properitary &#8220;<strong>WP Virtual Private Mail Server</strong>&#8221; which gives you a <strong>dedicated IPv6</strong> mail server like <strong>mail25342.wpvpms.com</strong> located in Germany (strongest data protection laws)</p><p>And when you switch to<strong> parallel processing</strong> on a powerful server you may reach up even to <strong>200 emails/second</strong> (10 parallel threads). </p>"
<https://campation.com/>