For domain mailboxes hosted on cPanel (common for SA firms). Password is encrypted at rest.
Use the exact IMAP/SMTP host from cPanel → Email Accounts → Connect Devices.
Note: Railway Hobby/Free blocks outbound SMTP (ports 465/587). You need Railway Pro (then redeploy) for send/connect to work from Railway.
Defaults to mail.yourdomain with IMAP 993 (SSL) and SMTP 465 (SSL). Use 587 if your host requires STARTTLS.