title: What might be causing my ubuntu 14.04 vps SMTP port 25 to refuse connections, yet IMAP port 143 works?
body: <p>I just installed a webmail client called Rainloop on my ubuntu 14.04 vps and i it installed with no errors but when configuring my domains to work with SMTP i get <code>stream_socket_client(): unable to connect tcp://mail.example.com:25 (Connection refused)</code> yet IMAP connects to port <code>143</code> with no problems.Can someone please help me fix this error?</p>