Technical Video: How are service providers trying to stop outbound spam? By Desmond Liao | 1 minute read On September 30, 2010, MailChannels CEO Ken Simpson talked about conventional anti-spam techniques are ineffective at stopping outbound spam. In video 3 of a 5-part series, he answered: How are service providers trying to stop outbound spam? – Using inbound anti-spam techniques for scanning outgoing email – Blocking port-25 – Blocking entire IP ranges – Manual handling by support staff Learn more about the Outbound Spam Challenge.