What are common issues with email sending in PHP, particularly when using 1und1 as a hosting provider?

Common issues with email sending in PHP when using 1und1 as a hosting provider include SMTP authentication errors and restrictions on sending emails from certain addresses. To solve these issues, make sure to configure the SMTP settings correctly and use the correct authentication method provided by 1und1. 

// Set the SMTP settings for 1und1
ini_set('SMTP', 'smtp.1und1.de');
ini_set('smtp_port', 587);
ini_set('sendmail_from', 'your_email@yourdomain.com');

// Set the authentication credentials
$smtp_username = 'your_email@yourdomain.com';
$smtp_password = 'your_password';

// Send email using PHPMailer or similar library

Keywords

SMTP 1und1 email delivery PHPMailer authentication error

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