Hostinger email account configuration is:
IMAP (Incoming) | POP3 (Incoming) | SMTP (Outgoing) |
Host: imap.hostinger.com Port number: 993 Encryption: SSL | Host: pop.hostinger.com Port number: 995 Encryption: SSL | Host: smtp.hostinger.com Port number: 465 Encryption: SSL/TLS |
You can always see the default email configuration for your account by navigating to the Emails → domain name → Configuration settings section:

Just scroll down to the Configuration Settings section and click on Manual Configuration:
Alternatively, you can find the same configuration by navigating to Hosting → Manage → Details section.
NOTES: