IronPort is certainly a leading email security device. I like IronPort's C-Series mail gateways, which use Bounce...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
Address Tag Validation (BATV). One spam attack that IronPort prevents is known as "joe-job," or a misdirected bounce attack. To execute this attack, a spammer sends emails with the intended recipient's address spoofed as the return address. This causes mail systems to inadvertently bounce the spam to the real victim. Bounce Address Tag Validation safeguards outgoing mail, adding an encrypted verification check to the SMTP FROM: field that makes it easier to distinguish between real addresses and fake bounced ones. What's great about this type of verification is that, unlike other email authentication technologies, it can be effective, even if other mail servers are not required to adopt it.
While I can't speak to your concerns about exposing IP addresses, it may help to know that each mail server that processes a message inserts a Received: header at the top of its list. The header includes the sender's IP address and provides a continuous track of a message's route. So, even if the sender uses a false email address when contacting the receiving server, modern mail transfer programs record the correct IP address of the sender. Thus an email message's "Received:" headers show how it has been routed to its destination. The IP address of the sender is more or less the only part of an email message that cannot be faked. It is next to impossible to spoof the IP address for the duration of the SMTP conversation. This is why IP addresses are a key component in combating antispam efforts and identifying known bad or good senders.
Dig Deeper on Email Security Guidelines, Encryption and Appliances
Related Q&A from Michael Cobb
What is BGP hijacking or IP hijacking and how do cybercriminals pull off the attacks? Expert Michael Cobb explains how enterprises can mitigate these...continue reading
Is the Dell eDellRoot security threat a serious problem and, if so, can it be prevented with self-signed root certificate authorities? Expert Michael...continue reading
What does FIPS 140-2 Level 2 certification for devices cover? Expert Michael Cobb explains the FIPS 140-2 security standard and how vendors use it in...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.