How many Includes can be in an SPF record?

10
An individual SPF record is limited to 10 “include” lookups. This means your record cannot generate more than 10 references to other domains.

Can SPF record have multiple includes?

Can you have multiple SPF records on a single domain? The answer is no: a domain MUST NOT have multiple SPF records, otherwise SPF fails with PermError. An SPF record is a TXT record in the DNS starting exactly with “v=spf1”, followed by an array of mechanisms and/or modifiers.

Why SPF record is not enough?

SPF records have a DNS lookup limit This means that if your organization uses multiple third party vendors who send emails through your domain, the SPF record can end up overshooting that limit. Unless properly optimized (which isn’t easy to do yourself), SPF records will have a very restrictive limit.

How do I get the limit of SPF 10?

Below are the common practices that allow you to comply with the 10 DNS lookup limit when creating an SPF record:

1. Remove unnecessary “include” statements.
2. Use ip4 and ip6 mechanisms.
3. Remove mechanisms that resolve to the same domain.
4. Remove “ptr” mechanisms.
5. Remove references to invalid and unused domains.

How do I combine SPF records?

To merge the SPF values, simply include all the parts into one single record, without repeating any mechanisms. This means that if both records have an a , it should only be included once at the beginning in the default record. If only one of the records includes an mx , it should also be included in the first part.

How do I add an existing SPF record?

Adding a Customized SPF Record to a Domain (Advanced)

1. Log in to the Account Control Center (ACC)
2. Click Domains.
3. Click Manage Your Domain Names.
4. Click the domain name that you want to put an SPF record on.
5. Click Manage Custom DNS Records.
6. Click Add DNS Records.
7. Next to Type Of Record, click the drop-down and select TXT.

Can SPF records be spoofed?

This means a fraudster can pass SPF authentication verification for a domain completely unrelated to the sending domain they are spoofing.

How do I fix SPF too many lookups?

The number of SPF lookups can be reduced by:

1. Cleaning up your record: Sometimes there are duplicate mechanisms in the record (for instance an MX record to Google Apps and an include from Google SPF)
2. Use subdomains for specific email flows.
3. Check if you’re using the correct included domains.
4. Use SPF macros (advanced)

What do I do if I have too many SPF lookups?

SPF implementations MUST limit the number of mechanisms and modifiers that do DNS lookups to at most 10 per SPF check, including any lookups caused by the use of the “include” mechanism or the “redirect” modifier. If this number is exceeded during a check, a PermError MUST be returned.

How do I fix SPF too many DNS lookups?

How do I fix “SPF too many DNS lookups”?

1. Remove unnecessary “include” statements.
2. Use ip4 and ip6 methods.
3. Remove mechanisms belonging to the same domain.
4. Delete all “ptr” mechanisms.
5. Use an SPF record that has been flattened.

How do I add a SPF record to a subdomain?

You can set an SPF record for both your primary domain and a subdomain.

1. If you want to set an SPF record for a primary domain, enter an @ in the ‘Name’ field.
2. If you want to set an SPF record for a subdomain, only enter the subdomain in the ‘Name’ field.

How do I add more than 10 lookups to an SPF rule?

If you need to add more than 10 lookups to an SPF rule, you can add a subdomain and create a new SPF rule for that subdomain to get around this limit. Additionally, check with your provider.

How many DNS lookups do I need for an SPF record?

More Information About Spf Included Lookups Your SPF record required more than 10 DNS Lookups to be performed during the test. The number of “include” mechanisms and chained “redirect’ modifiers should be kept to a minimum.

How many lookups does Google SPF have?

So without even following the included SPF records, we have 7 lookups. Now, let’s dive a level deeper. The google SPF record evaluates to: Each of which resolve to the following values: So google gives us 2 more lookups, bringing the total up to 9 Lookups.

Do ‘nested’ lookups count as SPF?

The ‘nested’ lookups also count. If you exceed this threshold, the items after the 10th lookup may (/probably will) not count as valid SPF sources. The number of SPF lookups can be reduced by: