Sender Policy Framework (SPF)

Sender Policy Framework (SPF) is an email authentication protocol that allows the owner of a domain to specify which mail servers they use when sending email from that domain. Brands sending email publish SPF records in the Domain Name System (DNS...

An SPF record is your way of telling mailbox providers which IP addresses or domains are authorized to send mail on your behalf, so it is very important that it is accurate and up to date. Sending email from an IP or domain not included in your SP...

An SPF record is your way of telling mailbox providers which IP addresses or domains are authorized to send mail on your behalf, so it is very important that it is accurate and up to date. Sending email from an IP or domain not included in your SP...

Sender Policy Framework (SPF) authentication verification results should be returned back to the sending Mail Transfer Agent (MTA) during the SMTP conversation. When checking for verification results, remember that not all mailbox providers use SP...

You must follow the syntax outlined in the SPF specification for your SPF record to work properly. If you do not follow these syntax rules, your SPF record will fail the authentication check. Common syntax errors Here are some common SPF record sy...

The SPF specification limits the number of DNS lookups to 10. This limit helps reduce the amount of resources used by mailbox providers when checking SPF records. If you exceed this limit, you will fail an SPF check. A DNS lookup requires the mail...

Sender Policy Framework (SPF) records use authorization type statements to tell mailbox providers how to treat your email. There are four different authorization types that you can include before the all statement at the end of your SPF record:  ...

One of the best tools for troubleshooting Sender Policy Framework (SPF) issues is available from Kitterman. Use Kittmeran’s SPF Query Tool to check if you have an existing SPF record and if it’s valid, check if your SPF record has any syntax error...

Sender Policy Framework (SPF) is an important authentication protocol used across the email industry to help prevent domain spoofing. However, there are a few limitations when SPF is used without DKIM and DMARC that prevent it from blocking domain...

All domains, regardless if they send email, should include a Sender Policy Framework (SPF) record. SPF is a widely adopted mechanism that identifies legitimate sending IP addresses and is taken into account by mailbox providers when treating recei...

A Sender Policy Framework (SPF) record should be added as a TXT type record to your Domain Name System (DNS). Using other record types was supported during SPF's early developmental stages, but TXT record types are easier and more practical.

Sender Policy Framework (SPF) records have a 255 character string limit in Domain Name System (DNS). If you have an SPF record with a string longer than 255 characters, you will fail the SPF authentication check. Here are some common ways to optim...

Sender Policy Framework (SPF) and SenderID are almost identical; however, they look at the domain in different parts of the email and appear differently in the Domain Name System (DNS): SPF looks at the domain listed in the MailFrom (MFrom) addre...

No. Microsoft no longer validates SenderID records, so there is no need to add SenderID records to the Domain Name System (DNS) for your domain. Add Sender Policy Framework (SPF) records to the DNS for your domain instead of SenderID.