Create an SPF record for a domain

SPF stands for Sender Policy Framework, and is a method by which the administrator of a domain explicitly specifies which mailservers are allowed to send mail for his domain. As this is just a TXT record that is put into the domains DNS zone file, the setup is fairly straightforward. A very basic SPF for might look like this:   IN TXT   "v=spf1 a mx ~all"

The above specifes that this is an SPF record for

v=spf1 – a required header that indicates this is an spf record
a – the A record for is allowed to send email
mx – the MX record for is allowed to send email

~all – all other mailservers trying to send mail will return a code of “softfail”. The mail will still go through, however it will be a suspect message

If you wished to allow another server to send mail through that had the hostname of, you would modify the record thusly:   IN TXT   "v=spf1 a mx ~all"

Also, if you wish to give a hard fail, and only allow those servers to send mail, the record would look like:   IN TXT   "v=spf1 a mx -all

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