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Accreditation takes reputation a step email sender line, allowing a third party (accreditation provider) to vouch for the reputation of senders, based on sophisticated reputation analysis. Accreditation services may require that senders pay to be listed and may be backed by a financial bond. In early 2004, Microsoft unveiled an anti-spam initiative based on a technology they called Caller ID for E-mail and implemented a pilot program for Hotmail. Then in the summer of 2004, Microsoft merged its product with SPF to form a new authentication specification called Sender ID. Sender ID is based on SPF but there are some differences. To use Sender ID, domain owners would publish the IP addresses of their mail servers in DNS using XML files rather than the TXT format used by SPF (however, Sender ID is backwardly compatible with already-published TXT files used by SPF). Sender ID originally used the Purported Responsible Address (PRA) instead of the MAIL FROM return-path address. The PRA is extracted from RFC 2822 headers; in other words, it's the address that users see as the sender in their e-mail client software. The return-path address and PRA address are the same on many messages, but they can be different. The agenda for the ESPC boot camp begins with deliverability basics, law and policy then continues on with several sessions addressing the different anti-spam efforts, authentication standards and best practices for AOL, Yahoo and Microsoft. The final session of the boot camp will be a holistic view of the future of deliverability. This workshop will take place the day before the Email Authentication Summit 2006, which will also be held in the Chicago Hilton. "The ESPC Deliverability Boot Camp" will be open to anyone attending the Summit and will provide insight into some of the major issues to be addressed at that event. In this article I will give you some information about SPF – Sender Policy Framework and its implementation. Some statistics state that nearly 75% of all email sender line, sometimes called UCE (Unsolicited Commercial Email). To help against this threat, several vendors are developing solutions against Spam. One solution is SPF. What is SPF? SPF is a solution to fight against email address forgery. SPF makes it easier to identify spam mails, viruses and worms. SMTP was developed at a time where only a few clients and servers existed. SMTP has very few security features. Originally, any SMTP server would accept mail from anyone, for anyone – this is known as an open relay. This wasn't a problem in the early days of the Internet, but until some time ago it was a real threat. Today open relay is no longer an issue for the majority of companies because the Admins have done their work and closed open relays. If there are any open relays they will be relatively quickly listed on Open Relay blocklists like http://ordb.org and many more. The biggest problem today is mail that’s correctly addressed to a valid mail address, but comes from a dubious source (Spammer). Sender Policy Framework (SPF), formerly Sender Permitted From, is an extension to the SMTP standard. SPF makes it easy to counter most forged "From" addresses in email, and thus helps to counter e-mail spam. The combination is also called SMTP+SPF. SPF operates at the level of the SMTP transaction, and requires at most three pieces of information: * The MAIL FROM: parameter of the incoming mail * The HELO or EHLO parameter of the sending SMTP server (used for Mailer-Deamon bounces which send a blank MAIL FROM) * The IP address of the sending SMTP server Benefits of SPF SMTP without SPF allows any computer to send email claiming to be from anyone so it is easy for spammers to send email from forged addresses. This makes it very difficult to trace back from which system Spam comes from. On the other hand it is very easy for Spammers to fake their sender address so that the receiver trusts these e-mails. It is very easy to implement SPF records in DNS. This is slightly different to the PTR mechanism because it doesn't require a special PTR DNS record, but instead performs exhaustive searches. We operate a video industry newsletter, specifically DVDs, for consumers. We had our requested newsletter spamfiltered last week because it had a review of the film Nathalie in it, which we described in the newsletter as “In this sexually charged story of infidelity, eroticism and desire, Emmanuelle Beart plays a Parisian prostitute who is hired by a married woman (Fanny Ardant) to seduce her husband (Gerard Depardieu).” Thus, the key issue in SPF is the specification for the new DNS information that domains set and receivers use. The exact specifications may change (the following specification is from 04/25/2004) but here is one example: ; zone file fragment for msexchange.org IN MX 10 mail.msexchange.org. ....... mail IN A 192.168.1.2 ; SPF enries ; domain SPF Msexchange.org. IN TXT "v=spf1 mx -all" ; mail host SPF mail IN TXT "v=spf1 a -all" Figure 2: SPF entries in DNS Use a contact form. Your website (or your company's) should not display employee emails online. Instead, use a coded contact form. When someone submits a message, the web server's contact application can forward to the appropriate parties, in multiple if necessary. When the receiving party responds to the contact form message, they will at that point be revealing their real email address. But hopefully they can distinguish between a real query and a fake one.

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