Slow Send Rate on AWS EC2 Instance

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@daflores63 I think it might be this line in file class.phplistmailer.php

        $ip_domain = gethostbyaddr($ip_address);

The function gethostbyaddr() is used to try to find a host name for your browser’s IP address when phplist is creating the header

Received: from [172.56.93.57] by phplist.dfconsults.net with HTTP; Mon, 03 Jul 2023 21:52:10 +0000

Can you try replacing that line to avoid the call

        $ip_domain = $ip_address;

This is line 221 in my file.

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