DNS Email

DMARC

Amazonon DMARC (http://sesblog.amazon.com/post/Tx22ZELXSSZRYZR/What-is-DMARC-and-should-you-use-it). This Google article is also helpful: https://support.google.com/a/answer/2466563?hl=en If you scroll down to the ‘Example records’ section, you’ll see a number of examples on how to write the TXT record. Here’s an example of that record: _dmarc.advancedmediawebs.com. 3600…

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DNS

DNS open resolver test

# dig +short test.openresolver.com TXT @1.1.1.1 (IP of the server) Other Information Test your server for an open DNS resolver here: http://openresolver.com/ Closing DNS Resolvers on Windows Server 2003/2008/2008 R2: http://technet.microsoft.com/en-us/library/cc787602(v=ws.10).aspx Windows Servers running Plesk: http://kb.parallels.com/en/116463 Closing DNS Resolvers on…

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