You may need to sync the mailboxes on your Mac with those on the mail server. Choose Mailbox Synchronize account. The Mail folder (located in your home Library folder) may be excluded from Spotlight searching. To check, choose Apple menu System. Login Yahoo Mail Account Separately Outside Mac. In your PC, open an internet browser.
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You may find that the search function inside Apple Mail is not working after upgrading to El Capitan. You may also be experiencing incomplete results when searching inside Mail. Here are the Top 3 things to try in order to get the Mac Mail search function working again in El Capitan.
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If you don’t get expected results when you search for email messages in the Mail app on your Mac, try these suggestions.
If a specific mailbox is selected in the Favorites bar, Mail searches only that mailbox. To search all mailboxes instead, click All.
Mail may not be looking in the Trash or Junk mailboxes, or searching encrypted messages. To include them when searching all mailboxes, choose Mail > Preferences, click General, then select the options.
You may need to sync the mailboxes on your Mac with those on the mail server. Choose Mailbox > Synchronize > [account].
The Mail folder (located in your home Library folder) may be excluded from Spotlight searching. To check, choose Apple menu > System Preferences, click Spotlight, then click Privacy.
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In the Mail app on your Mac, if the Send button is dimmed in the toolbar of your message, or your message can’t be sent using the outgoing mail server, try these suggestions.
Make sure the outgoing (SMTP) mail server is specified as directed by the provider of your email account. See Verify an email account’s outgoing server.
Choose Window > Connection Doctor, then follow the instructions displayed in the Details column.
If there’s a firewall problem, verify that firewall software isn’t blocking email traffic on port 25, 465, or 587. Also check whether you’re affected by another firewall, such as software installed separately from macOS or built into an internet sharing router, or administered by your email account provider. Contact the appropriate person for information.
You may be able to send messages from only a certain location, or your email account provider may allow you to send messages but with stricter settings (such as requiring a name and password). Contact your provider, then change the outgoing mail server settings in Mail preferences as needed.
See alsoApple Support article: If you can’t send email on your Mac