Smtpdebug phpmailer

SMTPDebug is a feature in PHPMailer that allows you to debug SMTP connections and transactions. It can be very helpful in troubleshooting issues with sending emails using PHPMailer.

Here's how to use SMTPDebug in PHPMailer:

1. Enable SMTPDebug: You can enable SMTPDebug by setting the SMTPDebug property to a value greater than 0. For example:

   $mail->SMTPDebug = 3;

   The value of SMTPDebug determines the level of debugging information that is output. Here are the possible values:

• 0: No debugging information is output.
• 1: Basic debugging information is output, including the SMTP connection and transaction details.
• 2: More detailed debugging information is output, including the SMTP commands and responses.
• 3: Debugging information is output at the lowest level, including the raw SMTP data.

2. Output debugging information: When you enable SMTPDebug, PHPMailer will output debugging information to the screen or to a log file, depending on the value of the SMTPDebug property.

Here's an example of what the debugging output might look like:

SMTP -> FROM SERVER: 220 mx.google.com ESMTP a14sm1044555pbc.14
SMTP -> FROM SERVER: 250-mx.google.com at your service, [2001:4860:4001:802::100a]
SMTP -> FROM SERVER: 250-SIZE 157286400
SMTP -> FROM SERVER: 250-8BITMIME
SMTP -> FROM SERVER: 250-STARTTLS
SMTP -> FROM SERVER: 250 ENHANCEDSTATUSCODES

This output shows the SMTP commands and responses that PHPMailer sends and receives during the email sending process.

3. Use a log file: If you want to save the debugging output to a log file instead of outputting it to the screen, you can set the SMTPLog property to a file path. For example:

   $mail->SMTPLog = 'smtp.log';

   This will save the debugging output to a file named smtp.log in the current working directory.

By using SMTPDebug, you can gain a better understanding of what's happening during the email sending process and troubleshoot issues more effectively.