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Hello reichmaj,

As this is specific to your Yahoo account, we'd recommend first going to Yahoo's website and logging into your account there. See if any emails are listed there that aren't accounted for in the iPhone's inbox.

Also, if you know you're not getting email, then we'd also recommend reviewing the following article for troubleshooting: If you can't receive email on your iPhone, iPad, or iPod touch - Apple Support

By default, Fetch New Data settings are based on what's provided by your email service. If Push isn't available as a setting, your account will default to Fetch. These settings affect how your device receives email. To adjust these settings:

1. Go to Settings > Mail, then tap Accounts.
2. Tap Fetch New Data.
3. Choose a setting — like Automatically or Manually — or choose a schedule for how often the Mail app fetches data.

With iOS 11 and later, and iPadOS, Automatically is set by default. Your device will fetch new data in the background only when your device is charging and connected to Wi-Fi.

Make sure that your Notification settings are correct for the Mail app:

1. Go to Settings, then tap Notifications.
2. Tap Mail, then tap an email account.
3. Adjust your Alerts, Sounds, and Badges.

Thanks for using Apple Support Communities!

Hello reichmaj,

Thanks for letting us know. To look at another possibility, are you using iOS 16.2 on your device? Updating can be helpful in clearing up unexpected behavior, so if you're not on iOS 16.2, we recommend backing up and updating. Here's how: Update your iPhone or iPad

If you get the same results after, or if you've already updated, use this link to check for contact options to reach us directly so we can look into this further: Apple Support

Take care.

reichmaj,

We appreciate the update. You'll be best assisted if you continue working with Apple Support directly since they'd be better equipped to look into the issue further with you: Get Support

Take care.