SMTP diagnostic tools can identify a wide range of issues that may affect email delivery. Some common problems include:
Authentication errors: Ensuring that the senderâs credentials are correct and that proper authentication methods are in place. Server misconfigurations: Identifying incorrect settings in the SMTP server that could hinder email delivery. Network issues: Detecting connectivity problems between the email client and the SMTP server. DNS configuration problems: Checking DNS settings to ensure that they are correctly configured for email delivery. Blacklist checks: Verifying whether the sending server is blacklisted and affecting deliverability.