Magento 2.2: Payments show message "Something went wrong with your request. Please try again later."

[bogdanshev2750]

Payments show message "Something went wrong with your request. Please try again later."

In exception.log I get "

 Unable to send mail: Unknown error {"exception":"[object] (Magento\\Framework\\Exception\\MailException(code: 0): Unable to send mail: Unknown error at /var/www/html/app/code/Magento/Email/Model/Transport.php:109, Zend\\Mail\\Transport\\Exception\\RuntimeException(code: 0): Unable to send mail: Unknown error at /var/www/html/vendor/zendframework/zend-mail/src/Transport/Sendmail.php:305)"} []

"

How can I solve this issue? 

[dipmegpro]

Hello @bogdanshev2750 

have you installed any extensions for mail send or do any changes regarding mail functionality or mail template?

[LitExtension Expert]

Please check if any extension for sending emails is installed. For example, mageplaza/module-smtp.
If yes, please review the SMTP module configuration.