Topmail Server Settings

Incoming Settings IMAP

Server hostname: imap.topmail.com
Port number: 993
SSL: Enabled
 

Outgoing (SMTP) Settings (same for both POP & IMAP)

Server hostname: smtp.topmail.com
Port: 587
TLS: Enabled

Some ISPs block port 25. The use of port 25 is now deprecated.

Incoming Settings POP

Server hostname: pop.topmail.com
Port number: 995
SSL: Enabled