On 25.09.2008 12:35, Jimmy Spam wrote: > Why I should use this port? What is the goal of his use? > On 25.09.2008 12:35, Jimmy Spam wrote: > Why I should use this port? What is the goal of his use?
See The Messaging Anti-Abuse Working Group http://www.maawg.org/about/publishedDocuments/ especially http://www.maawg.org/port25 Excerpt from the PDF: *Email Transmission Best Practices* Industry self-regulation is the most effective measure to address email transmission abuse, and the magnitude of the spam problem demands immediate action. The message has been received loud and clear from government agencies worldwide: absent immediate action and results, the industry faces increased scrutiny and regulation. Therefore, MAAWG recommends the following set of Email Transmission Best Practices for Internet and Email Service Providers: 1. Provide Email Submission services on port 587, as described in RFC 2476. 2. Require authentication for Email Submission, as described in RFC 2554. 3. Abstain from interfering with connectivity to port 587. 4. Configure email client software to use port 587 and authentication for Email Submission. 5. Block access to port 25 from all hosts on your network, other than those that you explicitly authorize to perform SMTP relay functions. Such hosts will certainly include your own Email Submission servers and may also include the legitimate Email Submission servers of your responsible customers. 6. Block incoming traffic to your network from port 25. This prevents potential abuse from spammers using asymmetric routing and spoofing IP addresses on your network. These practices have been adopted by providers of all sizes, including many of the most popular service providers in the world and many MAAWG members, without any appreciable reduction in customer base. Regards Alain Wolf
