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after setting up SMTP extension ,when send test mail giving error "Unable to send mail:unknown error" and in exception log gives bellow exception.

" main.CRITICAL: Unable to send mail: Unknown error {"exception":"[object] (Magento\Framework\Exception\MailException(code: 0): Unable to send mail: Unknown error at /var/www/magento/app/code/Magento/Email/Model/Transport.php:104, Laminas\Mail\Transport\Exception\RuntimeException(code: 0): Unable to send mail: Unknown error at /var/www/magento/vendor/laminas/laminas-mail/src/Transport/Sendmail.php:306)"} [] "

what would be the reason, and how could I get out of this.. Thank you.

  • login with proper gmail password and id – devmage Jun 23 at 5:36
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Can you give us the SMTP parameters ? Theh, checklist : 1st : Can you send the transactional emails ? 2nd : your server configuration. Is it a VPS ? a dedicated server ? is it Linux based or Windows ? postfix up & running ? credentials ?

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