In a blog, when the author replies to a visitor's comment, it's difficult for the visitor to notice the reply unless they revisit the page. However, with the comment reply email notification feature, visitors receive an email when the author or another visitor replies to their comment, allowing them to promptly learn about the response. In the widely used WordPress blog system, emails are typically sent via the system's default sendmail, which often ends up in spam folders. Therefore, we usually opt for email services like Tencent, Microsoft, or Google that provide domain-specific email solutions, which require sending emails via SMTP. The issue is that sendmail doesn't natively support SMTP, though this can be resolved using plugins within the blog system. However,...