Today ISP's are seriously working to rid their networks of spam. Email
can help these ISP's to validate that the
email is originating from a legitimate
source and the recipient can validate the mail source. So if an email
appears to come from one domain, while actually it is delivered from
the recipient can verify if the mail source is valid based on
information passed in the email. This is a great technique to prevent
and phishing scams.
ISP's uses different techniques to authenticate the incoming
and the three major standards prevailing are
- Sender ID
Sender ID is a Microsoft protocol which validates one
of the email's header fields. It retrieves the Purported Responsible
Address (PRA) for the email and then validates that address against the
It is used by Hotmail and Windows Live Mail.
- Sender Policy Framework (SPF)
SPF authenticates the envelope
HELO and MAIL FROM identities by comparing the sending mail server's IP
to the list of authorized sending IP addresses published by the sender
owner in a "v=spf1" DNS record. It is used by AOL, Google, Earthlink,
Hotmail, and many other providers.
DomainKeys uses cryptographic authentication to validate
the domain name that is associated with the message.
What are the benefits of email
All major ISP’s
like Hotmail, Gmail , AOL, Yahoo! and use email authentication to
suspected spam emails. By setting up Email Authentication, you can
enable these ISP’s to verify
that your campaign are from a “legitimate” source, and being delivered
to your target’s inbox, instead of being flagged as spam.
For example, here's an authenticated and non-authenticated
email in Hotmail:
What email header difference will my
contacts see if I use Benchmark Email
Benchmark Email includes the Sender ID if you have enabled the
Email Authentication. This information is part of the email header.
Hotmail, and MSN webmail clients would display these headers to the
Email Clients displaying only From Name (friendly name)
From: ABC Sales
These includes Outlook Exprees, AOL, Comcast, MacMail
Email Clients displaying From Name (friendly name) and From
Authentication is set off
If Email Authentication is enabled
These includes Microsoft Outlook, Hotmail, Entourage,