Why is PHP mail() Function discouraged for sending emails?

Disadvantages of the PHP mail() Function

The PHP mail() function is often discouraged for sending emails due to several limitations and potential issues. Here are some specific reasons why it's generally recommended to use a third-party library or extension instead:

• Incorrect Header Format: The mail() function doesn't handle header formatting according to all email standards. This can lead to emails being classified as spam or rejected by certain email providers.
• Sendmail Dependency: The mail() function relies on the presence and proper configuration of the sendmail program on the server. In some cases, sendmail may not be installed or configured correctly, resulting in failed email deliveries.
• Email Provider Restrictions: Free email providers like GMX and others often implement spam filters that block emails sent using the PHP mail() function. These emails may be deleted without notification to the recipient.

Additionally, there are other reasons to avoid using mail(), such as:

• No control over DNS records: With mail(), you cannot control the DNS records of the sending domain, which can affect the delivery rate of your emails.
• Lack of authentication: mail() does not support authentication mechanisms like SMTP, which can lead to security issues and reduced deliverability.
• Limited tracking options: mail() offers minimal tracking options, making it difficult to monitor email delivery and identify issues.

Therefore, it's generally advisable to use a more robust email sending library or extension that addresses these concerns and provides additional features for reliable email delivery.

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