Hello! I’m already installed iRedMail - https://www.digitalocean.com/community/articles/how-to-install-iredmail-on-ubuntu-12-04-x64
But after that I can’t send or receive emails in Roundcube webmail. It said to me: SMTP error (-1).
Please, help me.
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Can you post the whole error? Have you recently installed a firewall on your droplet?