With lots of users' practice and feedback, the most recommended way is using the third-party SMTP service to send the email.
Do not try to install Sendmail or other Mail server software on your Cloud Server for sending mail, because it has great difficulty in maintenance.
Taking Gmail's SMTP Service as an example, refer to the following steps to configure sending mail:
Log in Gmail console, and prepare your SMTP settings.
SMTP host: smtp.gmail.com SMTP port: 587 for TLS email, 465 for SSL-encrypted email SMTP Authentication: must be checked SMTP Encryption: must SSL SMTP username: Your Gmail address (e.g. firstname.lastname@example.org) SMTP password: Your Gmail password
Log in ONLYOFFICE console and open: 【Settings】>【Integration】>【SMTP Settings】
Fill in all the fields with accurate information.
【Host】and【Send Email Address】must be consistent, otherwise the email cannot be sent.
Click 【Send Test Mail】to check if it works.
More SMTP Service (Gmail, Hotmail, QQ mail, Yahoo mail, SendGrid and so on) settings or Issues with SMTP, please refer to Websoft9's SMTP Guide (opens new window)