not receiving emails sent by PHP script, need help debugging DNS

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Bids
26
Avg Bid (USD)
$15 / hr
Project Budget (USD)
$8 - $15 / hr

Project Description:
Php script is sending emails using mail() function but some email accounts are not receiving emails.
I need someone to look at the server configuration (CentOS, Plesk) and see why this is happening and fix the problem

Hours of work: 1 Hr / week Project Duration: < 1 week Skills required:
Apache, DNS, PHP, Web Hosting
About the employer:
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$14 / hr
Hours: 1 hr/ week
$15 / hr
Hours: 40 hr/ week
$15 / hr
Hours: 1 hr/ week
$31 / hr
Hours: 1 hr/ week
$8 / hr
Hours: 1 hr/ week
$26 / hr
Hours: 1 hr/ week
$8 / hr
Hours: 5 hr/ week
$15 / hr
Hours: 2 hr/ week
$11 / hr
Hours: 1 hr/ week
$10 / hr
Hours: 5 hr/ week