On your Mac, choose Apple menu System Preferences, then click Sharing. Open Sharing preferences for me. In the list on the left, select a service that is On. The network address for the service is displayed on the right. For example: If you select Screen Sharing, the network address looks similar to vnc://10.212.167.33 or vnc://name.example.com. MAC Address or media access control address is a unique ID assigned to network interface cards (NICs). It is also known as a physical or hardware address. It identifies the hardware manufacturer and is used for network communication between devices in a network segment. MAC Address usually consists of six groups of two hexadecimal digits.
Your Address Book when synced with iCloud will have more than one account.
You can view the accounts on your Address book using the 'Groups' listing by clicking the red ribbon with two silhouettes at the top of your Address Book. (You can return to 'List and Card' view by clicking the red ribbon with one silhouette at the top of your Address Book)
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Basics
Typically your Address Book will have an 'iCloud' account and an 'On My Mac' account. (But can have more accounts)
The 'iCloud' account syncs with your Address Book (Contacts) at iCloud.com and any other devices that are logged into your iCloud account and have contact syncing enabled in their settings (system preferences > iCloud for Address Book on your Mac and settings > iCloud for Contacts on your iOS device). This is referred to as your primary syncing account.
The 'On My Mac' account is only on your Mac and doesn't sync with other devices (unless you choose to synchronise with another service from address book preferences > accounts). This account may not be visible in 'Groups' if it has no contacts and is not set as your 'default' account.
You can add more (secondary) syncing accounts from either address book preferences > accounts or from system preferences > Mail, Contacts & Calendars. Secondary syncing accounts do not sync with your (primary) iCloud.com webpage, but can be set to sync with other devices if set up in a similar way on those devices.
In the image below the Address Book uses another iCloud account as a secondary account.
Default Account
Your 'default' account is set in address book preferences > general (the option is only displayed if you have more than one account). This option determines which account will be used for new contacts when you choose to view your Address Book by 'All Contacts' (i.e. viewing all accounts at once) or when you add contacts from Mail. Note; When adding contacts via the Address Book when only one account is selected for viewing, new contacts will be added to the account being viewed.
Duplicates
You may have duplicate contacts when your Address Book is viewed by 'All Contacts', this may be a result of choosing the wrong option when creating your iCloud account, it may also be how you wish to operate your Address Book.
If for example you are in a work environment and your 'iCloud' account is shared between co-workers, there maybe some details about contacts you do not wish to share, in such circumstances you may want to keep a duplicate contact with additional information in your 'On My Mac' account. To quickly duplicate a contact, drag it to your desktop, navigate to 'Groups', select the account you wish to duplicate to, double click the contact on your desktop.
If the duplicates you have are not wanted, you can use the 'Look For Duplicates' option from the 'Card' menu when a particular card is selected, or sort through your contacts manually looking for duplicates to delete. Before deleting any contacts you may want to make a back up of your contacts using file > export > address book archive....
Mail User Guide
You can send a message to one or more people, or to a group email address, and show or hide their email addresses. If you have multiple email addresses, you can choose which address to send your messages from and even an address for receiving replies.
Send to individual email addresses
In the Mail app on your Mac, do one of the following:
In an address field (such as To or Cc) of your message, type names or email addresses.
As you type, Mail shows addresses that you previously used in Mail or that it finds in the Contacts app. If you’re connected to network servers—say at work or school—it also shows addresses found on those servers.
Click an address field, then click the Add button that appears. Click a contact in the list, then click the email address.
Send to group email addresses
If you use groups in the Contacts app—say for a book club or cycling team—you can send messages to your groups.
In the Mail app on your Mac, choose Mail > Preferences, click Composing, then deselect “When sending to a group, show all member addresses.”
In an address field (such as To or Cc) of your message, type a group name.
If you decide you want to use individual contacts instead of the group—maybe you want to omit a few people—click the arrow next to the group name, then choose Expand Group.
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Tip: If someone in a group has multiple email addresses, you can choose which one to always use when you email the group. See Change addresses for contacts in a group.
Hide email addresses using Bcc
You can help protect the privacy of your recipients by sending your message so that recipients see “Undisclosed-recipients” in the To field, instead of each other’s email addresses.
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In the Mail app on your Mac, make sure the Bcc (Blind carbon copy) field is shown in the message window.
If you don’t see the field, click the Header Fields button in the toolbar of the message window, then choose Bcc Address Field.
Type your recipients’ addresses in the Bcc field.
You can leave the To field blank.
Set your From email address
If you set up email aliases or use several email accounts, you can choose which address to use when you send your messages.
In the Mail app on your Mac, move the pointer over the From field in your message.
Click the pop-up menu that appears, then choose an email address.
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If you want to use the same From address for all your messages, choose Mail > Preferences, click Composing, click the “Send new messages from” pop-up menu, then choose an email account. Or choose instead to have Mail automatically select the best address, based on the email address of the first recipient in your message, as well as the currently selected mailbox and message.
Set your Reply To email address
You can specify the address where you want to receive replies to your message.
In the Mail app on your Mac, click the Header Fields button in the toolbar of the message window.
Choose Reply-To Address Field, then enter the address where you want to receive replies to your message.
You can drag addresses between address fields and messages.
Some mail servers won’t send a message if even just one address is incorrect. Try to remove or correct invalid addresses, then send the message again.
You can import email addresses from other email apps into the Contacts app, to make the addresses available in Mail. See Import contacts.