SpamJadoo blocks spam at the level of the email transport protocol (SMTP). This is the unique aspect of SpamJadoo – other anti-spam solutions operate at the content level. Working at the protocol level enables SpamJadoo to “magically” stop spam before it is even sent !The technology that enables Spamjadoo to work its magic is ESP (Eliminate Spam at Protocol level). Let’s understand how it works.
SMTP protocol
Under the SMTP protocol, the sending server first attempts to establish connection with the receiving server – at this time the sender id and recipient id are sent across. ESP establishes at this point whether the sender is trustworthy or not. For this, over a hundred checks across almost a dozen levels are run to validate the sender. If the sender is not found trustworthy, a “hard bounce” results and the connection is closed. This leads to the sending server informing the sender that the intended recipient does not exist. And, all this has occurred before the email content is even sent !
The specifics may vary with the protection level setting chosen by the user. In some cases, a retry later message (smtp error 450) is sent first; if the retry is unsuccessful, the hard bounce (smtp error 550) is sent.
The multiple checks that are run include DHA, SPF, SMTP Auth, reverse DNS, blacklist/whitelist check, Senders Domain MX check, Blocking of specific attachments, and many more.
Despite the complexity, the engine is super-fast and adds virtually no delay to the mail transport.
Reverse DNS
Spamjadoo uses Reverse DNS lookups for IPV4 addresses through special domain in-addr.arpa. An IPv4 address is represented in the in-addr.arpa domain by a sequence of bytes in reverse order, represented as decimal numbers, separated by dots with the suffix .in-addr.arpa. For example, the reverse lookup domain name corresponding to the IPv4 address 101.102.103.104 is 104.103.102.101.in-addr.arpa. A host name for 1.2.3.4 can be obtained by issuing a DNS query for the PTR Record.
SPF
Its an e-mail authentication protocol that verifies the origin of the e-mail and prevents forged mail from entering an organization. In essence, Spamjadoo using Sender ID framework asks a question: Has this e-mail message been spoofed If the answer is Yes, it has been spoofed, the Spamjadoo rejects the message immediately. If the answer is ? No, we can confirm the sender´s authenticity,? the message is assigned a SPF status and gets accepted for further checking by Spamjadoo.
SMTP Auth
SMTP-AUTH extends SMTP to include an authentication step through which the client (outlook / thunderbird)effectively logs in to the mail server during the process of sending mail. Servers which support SMTP-AUTH can usually be configured to require clients to use this extension, ensuring the true identity of the sender is known. Spamjadoo follows the SMTP-AUTH as defined in RFC 2554. Server Administrator may use this to avoid phising and unwanted email traffic.
Block Specific Attachments : EXE, PIF, SCR,ASPX etc.
Now Spamjadoo is capable to block the emails with specific attachments like EXE, PIF, SCR,ASPX etc before receiving them into the network. These kind of attachments are discarded before they reach you. Again it happens at protocol level.. magically !!.
Challenge-Response
An integrated, automated challenge-response system is another highlight of ESP – genuine (but as yet unknown) senders can validate themselves with a couple of clicks and keystrokes. This works transparently to the recipient.
Outgoing mails
All mails, both incoming as well as outgoing, pass through Spamjadoo. ESP is therefore able to prevent spam from originating from your network, whether intentionally or as the consequence of virus or other malware.
Custom solutions
ESP implements the SMTP protocol – this can be leveraged to create custom, high-performance, high-reliability enterprise email solutions. Mail routing, dynamic re-routing, archival and backup are just some of the value.
JMail accounts
The JMail sub-system is another unique, revolutionary and thoughful feature of ESP. It allows custom JMail accounts to be created as programmable extensions to your mail account, and rules to be assigned to each such account. You can then invite trusted senders into your mailbox without compromising your privacy. Even if a trusted sender’s computer is hacked, or address book data (including your JMail id) is stolen, the JMail account is not accessible to anyone else without your permission. And the JMail accounts can be configured by you in a variety of ways to support common usage scenarios – newsletter subscription and online shopping are just two examples.In fact, JMail accounts offer a powerful way for you to sort and organize your incoming mail, without incurring the inconvenience of managing multiple mail accounts and Inbox folders.
It’s magic !
Remember all this occurs at the Spamjadoo layer – before the email server. You now understand why users call this "magical", and why we claim to "block spam even before it is sent".The ESP architecture works impeccably with all email protocols and servers. It is available both as a hosted service, as well as an application you can download and install on your server.