Change Account Information preferences in Mail on Mac
Use Account Information preferences in Mail to change general options for your email accounts.
To change these preferences in the Mail app on your Mac, choose Mail > Preferences, click Accounts, then click Account Information.
Enable this account
Make an account active or inactive. When you disable an account, it’s taken offline; the account’s mailboxes and messages don’t appear in Mail.
Indicates if the account is online (a green dot) or offline (a red dot).
The name of the account. This name appears in Mail — for example, in the sidebar.
The email address you want to use for sending messages. For an Exchange account, it’s the primary email address for the account on the Exchange server.
If you want to change the name that’s shown in your messages, or create an email alias, click the Email Address pop-menu, then choose Edit Email Addresses.
If you already use aliases, they are listed in the Email Address pop-up menu. They also appear in the From pop-up menu when you write a new message.
Mail always downloads media attachments (such as image, PDF, video or audio files) that you receive.
To have Mail automatically download other types of attachments (such as spreadsheets or zipped files), click the pop-up menu, then choose an option:
All: Mail always downloads these attachments.
Recent: Mail downloads only attachments of this type received within the past 15 months.
None: Mail doesn’t download any of these attachments.
Mail downloads attachments you receive to a special folder in your home Library folder.
Send large attachments with Mail Drop
Use iCloud to send large attachments. See Add attachments to emails.
This option is available for iCloud, IMAP and Exchange accounts.