Setting up Mail on iPhone (iOS 15/16/17)

In this guide, we show you how you can add your IMAP email account to the Mail app on your iPhone with iOS 15/16/17.

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Step 1 - Go to Settings > Mail

Open Settings on your iPhone and tap Mail.

Screenshot of the iPhone Apps list with a red arrow pointing to Mail.

Step 2 - Tap Accounts

Tap Accounts.

Screenshot of the Mail settings page with a red arrow pointing to Accounts.

Step 3 - Tap Add Account

Tap Add account.

Screenshot of the Accounts screen with a red arrow pointing to Add Account.

Step 4 - Tap Other

In this window, you will see all the account options available; select Other as the type of account.

Screenshot of the Add Account screen with a red arrow pointing to Other.

Step 5 - Tap Add Mail Account

Tap Add Mail Account at the top of your screen.

Screenshot of the Add Account options with a red arrow pointing to Add Mail Account.

Step 6 - Enter your account details

Enter the account details for the email you want to add:

  1. Name: the display name, which is the name your recipients will see when you're sending an email to them.
  2. Email: the email address you want to add.
  3. Password: the password you use when you're logging in to your Webmail.
  4. Description: a name for the account on your device.

Tap Next to continue.

Screenshot of the New Account setup screen showing account details with a red arrow pointing to the Next button.

Step 7 - Select IMAP

If not already selected, choose IMAP as the account type.

Screenshot of the New Account screen with a red arrow pointing to the IMAP tab.

Step 8 - Enter your server settings

Enter the following settings:

Incoming mail server:

  • Host Name: imap.one.com
  • Username: your email address
  • Password: the one you use for Webmail

Outgoing mail server:

  • Host Name: send.one.com
  • Username: your email address
  • Password: the one you use for Webmail

Tap Next in the upper-right corner to continue.

Note: Even though it says optional, the username and password must also be entered in Outgoing mail server settings.

Screenshot of the New Account screen with incoming and outgoing mail server settings entered and a red arrow pointing to Next.

Step 9 - Save the account

Make sure syncing of Notes is disabled and the slider is grey. Tap Save to continue.

Screenshot of the IMAP settings screen with Mail toggled on, Notes toggled off, and a red arrow pointing to the Save button.

Step 10 - Tap the account you added

Tap the account you just added. You can recognise it by the description.

Screenshot of the Accounts screen with a red arrow pointing to the newly added account

Step 11 - Tap your account again

Tap your account again to open the Settings.

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Step 12 - Tap Advanced

Tap Advanced, at the bottom of your screen.

Screenshot of the Account Settings page showing incoming and outgoing mail server information, with a red arrow pointing to Advanced.

Step 13 - Check Mailbox behaviours

Check if the Mailbox behaviours are set correctly. These settings determine where your emails are saved.

You need to select the following folders on the server:

  • Drafts Mailbox: Drafts
  • Sent Mailbox: Sent
  • Deleted Mailbox: Trash
  • Archive Mailbox: Archive

Make sure the Mailbox behaviours are set correctly. These settings determine the location where your emails are saved.

Tap the mailbox and select the correct folder on the server if no folder is selected. The name of the folder is in English.

Note: If you don't see the folder, log in to Webmail, place an email in the unavailable folder, and then try again.

Screenshot of the Advanced settings page with a red box highlighting the Drafts Mailbox, Sent Mailbox, Deleted Mailbox, and Archive Mailbox options.

Step 14 - Enter IMAP Path Prefix

Scroll down to the bottom of the screen and enter INBOX as IMAP Path Prefix, all in capitals.

Screenshot of the Advanced settings page with a red arrow pointing to IMAP Path Prefix set to INBOX.

Step 15 - Click Account and Done

Click Account in the upper left corner, and then click Done to save.

Screenshot of the iPhone Mail app showing the Inbox with example emails listed.

Step 16 - Done!

Congratulations! Your account is now set up correctly on your iPhone.

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