The Maps Dul is a list of Dial-Up IPs (which also includes cable and ADSL clients) that some SMTP administrators are using to block emails from reaching them.

There are a few reasons why someone might want to use the Maps Dul. One reason is to reduce the amount of spam that they receive. Spam is a significant problem for many people, and it can be difficult to filter out. Using the Maps Dul can help to block some of the spam that is sent from Dial-Up IPs.

Another reason why someone might want to use the Maps Dul is to protect their network from being attacked. Hackers often use Dial-Up IPs to launch attacks on networks. By blocking Dial-Up IPs, network administrators can help to protect their networks from being attacked.

However, there are also some drawbacks to using the Maps Dul. One drawback is that it can block legitimate emails from being delivered. This can be a problem for people who are trying to send emails to big-company domains, as their emails may not be able to get through.

Another drawback to using the Maps Dul is that it can be difficult to maintain. The list of Dial-Up IPs is constantly changing, so it can be challenging to keep the Maps Dul up-to-date. This can lead to legitimate emails being blocked, as the IPs that they are sent from may not be on the list.

Overall, the Maps Dul can be a useful tool for reducing spam and protecting networks from being attacked. However, it is important to be aware of the drawbacks of using the Maps Dul, such as the potential for blocking legitimate emails.

Typically, the solution is to use the ISP email relay service to forward our home emails, except when the ISP service is so bad that it takes many days to get the email delivered.

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