[RCU] Sending problems

[info]

Hello, I have a problem sending mail. I receive a lot of emails and I 
try to reply to them, but unfortunately I get a message that the message 
failed to send. Can I know the solution and why?
_______________________________________________
Users mailing list -- users@lists.roundcube.net
To unsubscribe send an email to users-le...@lists.roundcube.net