Sender Callout Exchange

• A mail host is a computer on the internet that is dedicated to transferring e-mail from senders to recipients.
• In the most general case, the sender of an e-mail message usually transfers it from his computer (using his mail client) to a mail transfer agent (MTA) within his provider's domain.
• Greylist: Senders who are not block-listed (excluded) or allow listed (accepted) can be placed on a greylist.
• Some anti-spam software can send greylisted addresses an automated response, challenging the sender to confirm their legitimacy.
• Although commonly used as an anti-spam system, and available with a number of mail transfer agents, sender verification callout has many of the same problems as challenge-response.
• Since most spam has forged "from:" lines, the verification step will result in an unwanted connection to the sender's system, tying up bandwidth of an innocent third party.
• This will cause all forged from: addresses to be accepted by the system trying to use sender verification callout.
• Etrust anti-spam allows mail only from approved senders into your inbox.
• You can make a list of approved senders by using your address book and existing contacts.
• All mail from unapproved senders goes into a separate folder for review or elimination.
• Sender verification callout: A spam-prevention system in which the identity of the sender of incoming email is verified before the email is accepted.
• The standard method is for the receiving system to connect to the mail server specified in the "from:" header and verify the sender's identity.
• Then a "challenge" message is automatically sent back to the sender, asking for a response, and if such a response is received, the sender's original message is delived.
• SPF (Sender Policy Framework) allows the owner of a domain to publishes an SPF record in the domain's DNS zone.

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