Use the following settings to install email on your iPhone.

ref: https://support.apple.com/en-us/HT201320

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Go to Settings > ‘Mail’, then tap ‘Accounts’

Tap ‘Add Account’

Choose “Other” then ‘Add Mail Account’

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Enter Name, Email, Password, Description:

Sam Harris (example)

[email protected] (example)

your-password

Sam Harris HIPAA Email (example)

Click NEXT (upper right)

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Protocol/Method
IMAP

INCOMING
Hostname
box.counselor.email

User
[email protected] (example)

Pass
your-password

OUTGOING
Hostname
box.counselor.email

User
[email protected] (example)

Pass
your-password

Click NEXT (upper right)