What details should I use for a WordPress SMTP plugin?

The best SMTP details to use when configuring an SMTP plugin within WordPress when you're using O2OHost WordPress hosting are:

Outgoing mail server: smtp.yourdomain.com

To view your SMTP hostname for mail setup, head to Manage Hosting and select the hosting package you need the SMTP hostname for.
In the Account Information section on the right-hand side, you’ll then see the Outgoing Mail Server which will be your SMTP hostname.

Outgoing server port (SMTP): 587

Use the following type of encrypted connection: TLS

Using these details will allow emails to be sent via SMTP from WordPress forms or allow any other SMTP-based plugins to send.