Here are some steps you can try to ensure emails from a specific sender reach your Inbox:

1. Check the sender’s address to ensure it appears correctly on your email list.
2. Add the sender to your contacts. This will help your mail provider know it isn’t spam.
3. Whitlelist the email address in your email client. This allows the email to bypass junk folder filtering.
4. If the sender is using a third-party service to send emails, they may need to add certain records to their domain.
5. Check your Junk folder’s settings. Make sure your filters aren’t too aggressive and inbox emails from your specific sender.