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This article assumes that you have already configured a mailbox using a Krystal cPanel account. To carry out the instructions in this article you will need the Manual Settings for your mailbox. You can obtain these in cPanel > Email Accounts by clicking on the More button next to your mailbox details, and selecting Configure Email Client.
There are now two options for setting up your email client. Option 1 is preferred, but does have some prerequisites.
Option 1 - Use mail.your.domain for inbound and outbound mail server (IMAP Hostname and SMTP Hostname)
Your domain’s A record must be pointing to your Krystal hosting server. If your domain is registered with Krystal then this is likely the case.
You must have SSL enabled for the domain. Once your domain is correctly pointing to Krystal a free LetsEncrypt certificate will be issued automatically.
If you meet these requirements then you can use the format mail.your.domain for the inbound (IMAP Hostname) and outbound (SMTP Hostname) mail servers in the instructions below e.g. if your domain is example.co.uk then you would use mail.example.co.uk as the inbound and outbound mail server names.
This option has the benefit of meaning that should you change hosting servers at any point you won’t need to re-configure any email clients. Once the DNS has updated for your new server A record the clients will continue to be able to send and receive email.
Option 2 - use the server hostname for inbound and outbound mail server
This option has no prerequisites. However, you should be aware that if you use this method, and at a later date change hosting servers you will need to re-configure any email clients.
If you are a reseller this would also impact all your client accounts.
Start the Mail application from the Dock, or by opening it from the Applications folder.
If you have not yet configured Mail, then skip to Step 3. If you already have one or more email accounts configured in mail.app then you must first choose Add Account... from the Mail menu.
This will present you with the Choose a mail account to add... Choose Add Other Mail Account... and click Continue.
Step 4 - Add a Mail Account
Click Create - Mail.app will try to autodiscover your settings and fail. The message Account must be manually configured will appear and the Create button will change to Next - Click Next.
Step 5 - Incoming Mail Server Info
Confirm the type of mailbox you wish to create - here we are creating an IMAP mailbox. Select IMAP.
Step 6 - Outgoing Mail Server Info
If you entered the correct incoming mailserver info, you will now see the Outgoing Mail Server Info panel.
Step 8 - Mailbox Prefix
Select Preferences from the Mail menu, or press cmd+. This will show the Preferences panel.
Step 9 - Final touches
Everything will now be setup correctly for secure SSL enabled email. Now we just need to tell mail.app which of your mail folders on the server are used for Trash and Sent items. So, click on the Sent folder under your new account as shown.
Then select Use This Mailbox For > Sent from the Mailbox menu, as shown
Once you have done this, your Krystal mailbox Sent items will appear under Mail's unified Sent folder as Shown. Repeat the process for the Trash. You can repeat this later for the Drafts folder if it appears. Once you have completed these steps, you may find that your Krystal mailbox appears to have vanished from Mail's sidebar, but worry not, it has just been incorporated into the Unified mailbox views at the top.
Advanced Settings - Step 1
If you are having problems with an existing mail account and would like to double check you have set it up correctly, here is how things should look for a Krystal based email account that has been configured for IMAP (recommended).
After clicking Edit SMTP Server List... you will be presented with a list of SMTP server profiles - you may have only one, or you may have more, depending on the number of mail accounts you have already set up. Click on the one that your Krystal email account is using (1).
Ensure that the Server Name field (2) is set to your Home Server name (as shown in your welcome email)
Click on Advanced and make sure that the settings are as above: