The "postmaster" e-mail address is a standard convention used in e-mail system administration. Traditionally, "postmaster@example.com" serves as a central point of contact for email-related issues for a specific domain (in this case, "example.com").

Here are some important aspects of the "postmaster" e-mail:

Purpose:

It is intended for e-mail administration and system maintenance.
It serves as a point of contact for external email-related problems, such as delivery issues, spam reports, and authentication problems (SPF, DKIM, DMARC).

Internet standard:

The existence of a "postmaster" address is a requirement defined in the Internet e-mail standards, specifically in RFC 5321.
This standard ensures that there is always a way to contact someone responsible for a domain's email services.
Technical issues and abuse:

System administrators use the "postmaster" address to receive notifications about technical problems, such as delivery errors, bounces, and other routing issues.
It is also used to report email abuse, such as phishing or spam activities originating from the domain.
Maintenance and monitoring:

The address should be monitored regularly by an administrator or IT team to ensure that critical issues are attended to promptly.
Ideally, it should be configured to accept emails from any source, to ensure effective communication about email problems.
Privacy and Security:

Due to its nature, the "postmaster" address can be a target for spam. It is therefore important to have appropriate filters and security measures in place.
It must be managed in such a way as to protect the privacy and security of incoming communications.
In short, the email "postmaster" is a vital part of a domain's email infrastructure, offering an essential communication channel for email administration and security-related issues.