Fix PHP + Mail Server Error on my website

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Job Description

Hello,
I have this website http://goo.gl/OZKGA
It is a website where you can sign up for an account and send text messages to people
When users create an account there is a php function that creates an email account for them in the Linux server - its SMTP email account
The email account is like username@zoomm.com
Then they they can send out messages

After they send out messages, the receiver can reply back
The reply goes into their SMTP email account
Then we have a cron function that scans the SMTP inbox every hour and moves emails from SMTP inbox to a mysql database

The system was working before but one of my programmers who is not available did a small error and the reply part is not working

The email accounts are created successfully at sign up
The messages sent are going out successfully
I am not sure the messages sent back are received by the server email client
I am not sure the messages sent back are being transferred to the database

The project is urgent and serious
You need to be knowledgeable in mail servers, Linux CentOS, and PHP
The server is managed via Plesk control panel
The fix might be very small - the website was working just days ago

Thanks

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Skills: linux

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