The external links are old and outdated.

Shawniverson (talk) 21:30, 3 September 2016 (UTC)Reply

Expanded this article a little bit and added citations from reliable sources

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Hello, fellow Wikipedians I found this article and decided to start expanding upon it to help improve its quality. I plan to work on this article some more and add more content and possibly pictures of anti-spam appliances. I did some research on the technologies and added some citations from reliable sources to support the content of the article. I will add some more as I have free time. Stay tuned, and as always, any help is appreciated. Jeffreythelibra (talk) 03:39, 4 January 2023 (UTC)Reply