Out of memory: The process php

This is straight forward, the process "php" was terminated because of the system was low in memory. Based on the 14 emails that were sent all at the same time, and a final email (15th email) letting me know that the "mailman" service was was not part of the cPanel"s chkservd service - I'm looking at the email notifications per the 14 concerning the "Out of Memory based on low memory error" - I'm trying to decipher if it's the "Spam Assassin" service or something else.

PID    Owner    CPU %    Memory %    Command
12930    mysql    1.03    2.89    /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/lib/mysql/XXXX-XXXX-XX.XXXX.com.err --open-files-limit=10000 --pid-file=/var/lib/mysql/XXXX-XXXX-XX.XXXX.com.pid
25242    XXXX    41.47    2.22    /usr/bin/php /home/XXXX/public_html/index.php
22959    root    1.40    1.46    /usr/local/cpanel/3rdparty/perl/514/bin/spamd --daemonize --max-spare=1 --max-children=3 --allowed-ips=127.0.0.1 --pidfile=/var/run/spamd.pid -i127.0.0.1
22961    root    0.00    1.42    spamd child
25269    root    12.96    0.89    tailwatchd - chkservd - sending OOM notification

This is what the 14 emails look like, I have replaced items with "X's" as one can see. There was also a "oom_dmesg.txt" file atatched to each email. A preview:

[10476] 0 10476 1611 90 0 0 0 grep
[10477] 0 10477 1611 92 3 0 0 grep
[10480] 99 10480 2986 78 3 0 0 suphp
[10484] 508 10484 3536 192 0 0 0 suphp
[10485] 508 10485 3536 192 3 0 0 suphp
[10487] 508 10487 12637 65 2 0 0 php
[10488] 508 10488 3536 191 0 0 0 suphp
[10491] 99 10491 19920 120 1 0 0 httpd
Out of memory: Kill process 9661 (mysqld) score 7 or sacrifice child
Killed process 9661, UID 498, (mysqld) total-vm:2364300kB, anon-rss:36180kB, file-rss:564kB

I'm attempting to locate the root of the issue.

Out of memory: The process php

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