Magento 2 extension which allows custom SMTP such as SendGrid, MailUp etc for sending transactional email
Magento 2 module which allows custom SMTP such as SendGrid, MailUp etc for sending transactional email.
Admin configurations located at Stores -> Configuration -> Advanced -> System -> Custom SMTP
composer require monashee/module-smtp
php bin/magento module:enable Monashee_Smtp php bin/magento setup:upgrade php bin/magento setup:di:compile
You may need to Flush Magento Cache after installation.
I would suggest removing the module since it overwrites the Mail Sending Settings.
php bin/magento module:disable Monashee_Smtp php bin/magento module:uninstall Monashee_Smtp php bin/magento setup:di:compile
Magento should remove it from your composer.json and composer.lock files as well as deleting from vendor folder.