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Tuesday, August 11, 2015

How to use an SPF Record to Prevent Spoofing & Improve Google E-mail Reliability.

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A carefully tailored SPF record will reduce the likelihood of your domain name getting fraudulently spoofed and keep your email from getting flagged as spam before they reach your recipients emails. Google Email spoofing is the creation of email messages with a forged sender email address; something that is simple to do because many email servers do not perform authentication. Spam and phishing mails typically use such spoofing to mislead the recipient about the origin of the “message”. A number of measures to email address spoofing, however, have developed over the years: SPF, Sender ID, DKIM, and DMARC. Sender Policy Framework (SPF) is a "Email" validation system designed to prevent spam by detecting e-mail spoofing. Today, nearly all abusive e-mail messages carry fake sender’s email addresses. The victims whose email addresses are being abused often suffer from the consequences, because their reputation gets diminished, they have to waste their time sorting out misdirected bounce (email) messages, or (worse) their IP addresses get blacklisted.
The SPF is an open standard specifying a technical method to prevent sender’s-email address forgery. SPF allows administrators to specify which hosts are allowed to send mail on behalf of a given domain by creating a specific SPF record (or TXT record) in the Domain Name System (DNS). Mail exchangers use DNS (Domain Name System) records to check that email from a given domain is being sent by a host sanctioned by that particular domain's administrators



Benefits

Adding an SPF record to your DNS zone file is the best way to stop email spammers from spoofing your domain. In addition, an SPF Record will reduce the number of legitimate E-mail messages that are flagged as spam or bounced back by your recipients' mail servers. The SPF record is not 100% effective, unfortunately, because not all e-mail service providers check for it. Many do, however, so you should notice a significant decrease in the amount of bounce-backs you receive.


Example SPF Record

An SPF record is added to your domain's DNS zone file as a TXT record and it identifies authorized SMTP servers for your personal domain.
TXT @ "v=spf1 a include:_spf.google.com ~all"