I am using Magento 2.3 , I try to send a mail but unfortunately, I am not able to send any mail I got error

Unable to send mail: Unknown error at /home/public_html/proj/vendor/zendframework/zend-mail/src/Transport/Sendmail.php:305)"} []

then I am using Hostgator Server is there anything configured from server side because I tried mageplaza smtp module it says mail sent successfully but I didn't get any mail

how do i fix this ?

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