What potential issues can arise when sending emails from a different domain using PHP?

When sending emails from a different domain using PHP, the email may get flagged as spam by the recipient's email provider due to SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) authentication checks. To solve this issue, you should set up SPF and DKIM records for the domain you are sending emails from to ensure they are properly authenticated. 

// Example PHP code to set the "From" header with a valid email address from the sending domain
$from_email = 'noreply@example.com';
$headers = 'From: ' . $from_email . "\r\n";

Keywords

SPF DKIM SMTP email headers domain authentication

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