Most probably it’s because SPF misconfiguration.
SPF allows the owner of an Internet domain to specify which computers are authorized to send mail with sender addresses in that domain, using Domain Name System (DNS) records. Receivers verifying the SPF information in TXT records may reject messages from unauthorized sources before receiving the body of the message. – Wikipedia
You can install plugin which allows you sending emails through SMTP using your mail account. Configuration should be as simple as configuring e-mail client like Outlook or Thunderbird. You can use for example this plugin: Easy WP SMTP.
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