How to Set Up IsabiMail Suite Email in Apple Mail (Mac, iPhone, iPad)

Apple Mail is the default email client on every Mac, iPhone, and iPad. If you use IsabiMail Suite for your business email, adding your custom domain account to Apple Mail takes just a few minutes. This guide walks you through the setup on every Apple device, plus CalDAV and CardDAV configuration for calendar and contact sync.

What You Need Before You Start

Before configuring Apple Mail, make sure you have the following ready:

• Your full IsabiMail Suite email address (e.g., you@yourdomain.com)
• Your IsabiMail Suite email password
• Your domain must already be added and verified in your IsabiMail Suite dashboard

Here are the server settings you will use across all Apple devices:

Setting	Value
Incoming Server (IMAP)	mailserver.isabi.email
IMAP Port	993
IMAP Security	SSL/TLS
Outgoing Server (SMTP)	mailserver.isabi.email
SMTP Port	587
SMTP Security	STARTTLS
Username	Your full email address
Password	Your email account password

Set Up IsabiMail Suite in Apple Mail on Mac

Follow these steps to add your IsabiMail Suite account to Apple Mail on macOS:

1. Open Apple Mail on your Mac.
2. In the menu bar, click Mail then Add Account (or go to System Settings > Internet Accounts > Add Account).
3. Select Other Mail Account and click Continue.
4. Enter your Name, full IsabiMail Suite email address, and Password. Click Sign In.
5. Apple Mail will attempt to auto-detect settings. If it cannot find them automatically, you will be prompted to enter them manually.
6. Set the account type to IMAP.
7. For Incoming Mail Server, enter mailserver.isabi.email.
8. For Outgoing Mail Server, enter mailserver.isabi.email.
9. Click Sign In.

Apple Mail will verify your credentials and connect to the IsabiMail Suite server. Once verified, your inbox will begin syncing. If you see a security prompt about the server certificate, click Continue to accept it.

Verify IMAP and SMTP Settings on Mac

If email is not syncing correctly after setup, verify the port and security settings:

1. Go to Mail > Settings > Accounts.
2. Select your IsabiMail Suite account and click Server Settings.
3. Under Incoming Mail Server (IMAP), confirm the port is 993 and Use TLS/SSL is enabled.
4. Under Outgoing Mail Server (SMTP), confirm the port is 587 and Use TLS/SSL is enabled (this uses STARTTLS).
5. Make sure Authentication is set to Password for both incoming and outgoing.

Set Up IsabiMail Suite in Apple Mail on iPhone and iPad

Adding your IsabiMail Suite email to an iPhone or iPad is straightforward:

1. Open Settings on your iPhone or iPad.
2. Scroll down and tap Mail (or Apps > Mail on iOS 18+).
3. Tap Mail Accounts then Add Account.
4. Tap Other at the bottom of the provider list.
5. Tap Add Mail Account.
6. Enter your Name, Email (full IsabiMail Suite address), Password, and an optional Description. Tap Next.
7. Select IMAP at the top of the screen.
8. Under Incoming Mail Server:
   • Host Name: mailserver.isabi.email
   • User Name: Your full email address
   • Password: Your email password
9. Under Outgoing Mail Server:
   • Host Name: mailserver.isabi.email
   • User Name: Your full email address
   • Password: Your email password
10. Tap Next. iOS will verify the settings and connect to IsabiMail Suite.
11. Choose which services to sync (Mail, Notes) and tap Save.

Your IsabiMail Suite inbox will now appear in the Mail app. New messages should start loading within a few seconds.

Set Up CalDAV for Calendar Sync

IsabiMail Suite supports CalDAV, which lets you sync your IsabiMail Suite calendar with Apple Calendar on Mac, iPhone, and iPad. This means events you create in the IsabiMail Suite webmail calendar will appear on all your Apple devices, and vice versa.

On iPhone or iPad

1. Open Settings.
2. Go to Apps > Calendar > Calendar Accounts (or Calendar > Accounts on older iOS).
3. Tap Add Account then Other.
4. Under Calendars, tap Add CalDAV Account.
5. Enter the following:
   • Server: mailserver.isabi.email
   • User Name: Your full IsabiMail Suite email address
   • Password: Your email password
   • Description: IsabiMail Suite Calendar
6. Tap Next. The device will verify and save the account.

On Mac

1. Open System Settings > Internet Accounts.
2. Click Add Account then Other.
3. Select CalDAV Account.
4. Set Account Type to Manual.
5. Enter mailserver.isabi.email as the server, your full email as the username, and your password.
6. Click Sign In.

Your IsabiMail Suite calendars will now sync with the Apple Calendar app on all your devices.

Set Up CardDAV for Contacts Sync

CardDAV syncs your IsabiMail Suite address book with Apple Contacts. Any contact you add in IsabiMail Suite webmail will appear on your Apple devices automatically.

On iPhone or iPad

1. Open Settings.
2. Go to Apps > Contacts > Contact Accounts (or Contacts > Accounts).
3. Tap Add Account then Other.
4. Under Contacts, tap Add CardDAV Account.
5. Enter:
   • Server: mailserver.isabi.email
   • User Name: Your full IsabiMail Suite email address
   • Password: Your email password
   • Description: IsabiMail Suite Contacts
6. Tap Next to verify and save.

On Mac

1. Open System Settings > Internet Accounts.
2. Click Add Account then Other.
3. Select CardDAV Account.
4. Set Account Type to Manual and enter mailserver.isabi.email, your email, and password.
5. Click Sign In.

Troubleshooting Common Issues

Authentication Failed / Cannot Verify Account

This is the most common issue during setup. Here is how to fix it:

• Double-check your password. The password is for your IsabiMail Suite email account, not your IsabiMail Suite dashboard login (they may differ if you changed one separately).
• Use your full email address as the username. Enter you@yourdomain.com, not just you.
• Make sure the account exists. Log in to your IsabiMail Suite dashboard and confirm the email account is created and active under your domain.

Cannot Send Email (SMTP Error)

If you can receive email but cannot send, check these settings:

• Outgoing server must be mailserver.isabi.email on port 587 with STARTTLS enabled.
• Authentication must be turned on for the outgoing server. Apple Mail sometimes defaults to "no authentication" for SMTP \u2014 change it to Password.
• Make sure the SMTP username and password are filled in (same as your incoming credentials).

SSL Certificate Errors

If you see a warning about the server certificate:

• Make sure you are using mailserver.isabi.email as the server \u2014 not your own domain name. The SSL certificate is issued for mailserver.isabi.email, so using any other hostname will trigger a mismatch warning.
• If prompted, tap Continue or Trust to accept the certificate. This is safe when connecting to mailserver.isabi.email.

Email Not Syncing or Slow to Update

• On iPhone/iPad, go to Settings > Mail > Accounts > Fetch New Data and set your IsabiMail Suite account to Push or Fetch every 15 minutes for faster updates.
• On Mac, go to Mail > Settings > Accounts, select your IsabiMail Suite account, and set Check for new messages to Automatically.
• Make sure you have a stable internet connection. IMAP requires an active connection to sync.

Calendar or Contacts Not Syncing

• Verify that your CalDAV/CardDAV server is set to mailserver.isabi.email (not https://mailserver.isabi.email \u2014 the device adds the protocol automatically).
• On iPhone, go to Settings > Calendar > Default Calendar and make sure it is set to your IsabiMail Suite calendar if you want new events to save there.
• On Mac, open Calendar > Settings > Accounts and click Refresh Calendars to force a sync.

Summary of All Server Settings

Service	Server	Port	Security
IMAP (Incoming)	mailserver.isabi.email	993	SSL/TLS
SMTP (Outgoing)	mailserver.isabi.email	587	STARTTLS
CalDAV (Calendar)	mailserver.isabi.email	443	SSL/TLS
CardDAV (Contacts)	mailserver.isabi.email	443	SSL/TLS

All services use your full IsabiMail Suite email address as the username and your email account password for authentication.

Need help? If you run into any issues not covered here, contact IsabiMail Suite support or check the IsabiMail Suite blog for more email setup guides.

Do not have a IsabiMail Suite account yet? Create your free account and get your custom domain email set up in under 2 minutes.