Cannot send emails

[sun]

The roundcube message was sent successfully, but did not arrive at the recipient's message.

 

[Harry Tang]

Hi,

Check the spam box, you may need config DKIM. If nothing in spambox, check if your server provider block sending port.

 

[zEitEr]

Hello,

There might be too many reasons of it, so you need to investigate it through mail logs /var/log/exim/mainlog