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Article #24 Date Entered: 09-15-2009
Without warning Tuesday evening Verizon blocked standard sendmail port 25. Air America customers could receive mail but could no send outgoing mail. http://www22.verizon.com/ResidentialHelp/HighSpeed/General+Support/Top+Questions/QuestionsOne/124274.htm What is outbound port 25 blocking? Outbound port 25 blocking is a network configuration change that will prevent computers on the Verizon network from connecting to servers outside of our network. Servers outside the Verizon network use a method commonly employed to send unauthenticated, unsolicited e-mail or “spam”. Why is Verizon blocking outbound port 25? The majority of spam (unsolicited email) on the Internet is caused by malicious software viruses that take control of infected computers. These viruses direct the infected machines to send email through port 25. Verizon takes spam very seriously. Verizon blocks outgoing connections on port 25 to prevent infected computers from being used by spammers to send unsolicited email. Outbound port 25 blocking is a standard industry method to control spam. When will outbound port 25 blocking be implemented? We will begin implementing outbound port 25 blocking in the first quarter of 2009.