What are the configuration settings for setting up Openprovider email solution on various email clients?

Configuration settings vary by client. For general settings: 
Protocol
Server Hostname
Ports
IMAP
mail.op-email.eu
993 (SSL)
143 (non-SSL)
SMTP
mail.op-email.eu
587 (TLS/STARTTLS)
25 (non-SSL)
POP
mail.op-email.eu
995 (SSL/TLS)
110 (non-SSL)
Use your full email address as the username and your password.