![]() Do not modify them unless you are absolutely sure what you want to achieve using IP ranges, and how to achieve it.HMailServer is an open source email server for Microsoft Windows. Unless you're using old email clients with a lack of features, you should never have to modify these. These default IP ranges should be sufficient for almost all users. By default, hMailServer comes with 2 different IP ranges. For example, you can use the IP ranges to configure hMailServer such that only computers in your local network are allowed to use the server to send email. IP ranges are used in hMailServer to specify who should be allowed to send email through your server. Also, you should leave this field empty if your ISP is not blocking port 25. Please note that you should never specify localhost, 127.0.0.1, or your own hostname as the SMTP Relayer, since that would mean that hMailServer would try to forward messages to itself. In the SMTP Relayer field, enter the host name of your ISP's email server, along with your credentials on that server in case it demands authentication.Since it's almost always possible to send email through your ISP's email server, this is a workaround if port 25 is blocked. If you configure your ISP's email server as SMTP relayer, hMailServer will deliver all outgoing email to your ISP's email server, which in turn will deliver it to the correct destination. If you can connect, port 25 is not blocked if you can't, port 25 is blocked. To determine whether port 25 is blocked, try typing telnet 25 on your command line. Since outgoing traffic on port 25 is required for email to work properly, you either need to convince your ISP to open up port 25 for you (if it's not open), or you need to configure hMailServer to forward all email through your ISP's email server. Some internet service providers (the people that offer you the internet connection) block outgoing traffic on port 25. Under host name, enter the public hostname of the computer where hMailServer is running. ![]()
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