Problem sending emails

Problem sending emails

Hi, I use roundcube in my own domain, but when I try to send an email, roundcube keeps loading and loading. I check the configuration and is ok.

Server: ssl://smtp.zoho.com (Roundcube requires to use ssl://). Also tried with tls://smtp.zoho.com
Port: 465 // 587
Username: user@domain.com
Password: mypass

IMAP works. I can recieve emails, but the problem is I can't send.