Emails not sending from whmcs

[hmaddy]

Am using an older version of whmcs and it will work only with php74. i hosted my whmcs on a seperate dedicated server and the server have only this account. And am using external smtp for sending mails. i already configured the /etc/exim.conf.local file. but now the problem is its not working. when i select a test mail, whmcs throwing some error like "

Validation Error: Could not instantiate mail function.

Server is with cloudlinux 9.6 and using altphp74.

 

[WHMCS John]

Hi @hmaddy,

Please begin your troubleshooting by referring to this guide: https://docs.whmcs.com/troubleshooting/troubleshoot-email/php-mail/could-not-instantiate-errors/

[WHMCS Danny]

Correct, start there, as this error occurs when you have selected PHP Mail as your Mail Provider setting.
This would typically indicate that the mail server rejected the system’s attempt to send mail.

The PHP Mail function uses the server’s mail() function, which is not always reliable. It also doesn’t generate a friendly error.

You would need to work with your server administrator or your hosting provider's support team to review your server configuration and to ensure that the server’s mail() function is working as expected. Otherwise, choose another Mail Provider in the Mail tab at Configuration () > System Settings > General Settings. These other methods are usually more reliable when sending emails and provide further errors, if there is an issue. For further information, please review the following documentation: https://docs.whmcs.com/8-13/system/email/mail-providers/

There is a table in that documentation with instructions for different Mail Providers and how to configure them in WHMCS.

I hope this additional information helps!