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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 20i WordPress Hosting are: 

Outgoing mail server: smtp.stackmail.com

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.