clarkwinkelmann wwwn I think you didn't copy the first line of the error. The line starting with 0 is the first line of the backtrace, and should be preceded by the actual exception.
luceos Can you post your most recent settings, because the host mail.example.com and encryption none aren't valid values for mail. Mask out your credentials.
wwwn luceos I've tried leaving the TLS, SSL and none and blank on the password section but it didn't. My final settings are as shown in the picture below. My mail server is not using encryption.
wwwn luceos I haven't tried the service. Google Mailgun Zoho Mail I'm his last mail server. Only Yandex works fine in SMTP .... Flarum - 0.1.0-beta.8.1 PHP 7.2.15 MySQL 5.7.25-0 Nginx server
[deleted] wwwn Are you running on vps? It seems mail transfer agent not installed on your server. It should be installed to sending or receiving mail, if you have postfix server etc, you should have able to send mail without filling to mail info on admin panel.
wwwn [deleted] Thank you for your answer. The problem was caused by postfix settings, and now everything is working fine.
wwwn Likqez I have followed the instructions in the link below. 1- https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-on-ubuntu-18-04 2- https://www.digitalocean.com/community/tutorials/how-to-set-up-a-mail-relay-with-postfix-and-mailgun-on-ubuntu-16-04
