Why Are My PHP Emails Not Delivering?

Troubleshooting PHP Mail (Potential Reasons for Undelivered Emails)

When using the PHP mail() function to send emails, it's crucial to address any potential issues that may prevent emails from being delivered successfully. While the function may return true, emails may not reach their intended recipients.

Possible Causes of Undelivered Emails:

• Sender Address (From) Issue: Ensure that the sender address ("From") belongs to a domain on your server. If not, modify it accordingly.
• Blacklisted Server IP: Check if your server's IP is on a blacklist (such as spamhaus.org). This is typically not an issue with shared hosting, but it's worth considering.
• Spam Filtering: Determine if emails are being filtered by spam filters. Send test emails to accounts with and without spam filters to verify this.
• "-f" Parameter Misuse: The -f parameter of the mail() function can specify the sender address. Ensure that it is used correctly if necessary. Refer to the PHP manual for details.
• Log File Analysis: Check server log files for any errors or messages related to email sending.
• Bounce Mails: Monitor the "from:" address for potential bounce mails ("Returned to sender"). Consider setting up a separate "errors-to" address to receive these notifications.

Additional Resources:

For a more detailed analysis in German, refer to the following resource: [Troubleshooting Email Delivery in PHP](https://www.capgemini.com/de-de/service/consulting/newsletter/versandprobleme/).

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