What happens if you have too many SPF lookups?
What Will Happen If The SPF DNS Lookup Limit Is Exceeded? If the SPF implementation on the receiving email servers finds more than 10 DNS querying modifiers in the sender’s domain SPF, it returns SPF permerror “too many DNS lookups.” As a result, the sent email might not reach the inbox.
How do I fix SPF too many lookups?
The number of SPF lookups can be reduced by:
- 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)
- Use subdomains for specific email flows.
- Check if you’re using the correct included domains.
- Use SPF macros (advanced)
How many entries can you have in an SPF record?
10 entries
There is a lookup limit of 10 entries, so you need to ensure that you consolidate your sending sources within this lookup limit. If it is a case you need to enter multiple entries for an SPF TXT record, for a domain, it is suggested that you split the record up into multiple smaller records.
What happens if there are 2 SPF records?
The answer is no: a domain MUST NOT have multiple SPF records, otherwise SPF fails with PermError. An SPF check starts by fetching all TXT records starting exactly with “v=spf1” on a domain: if no such record is found, it returns None ; if multiple such records are found, it returns PermError .
Can I have a TXT or SPF record longer than 255 characters?
You can enter a value of up to 255 characters in one string in a TXT record. You can add multiple strings of 255 characters in a single TXT record. The maximum length of a value in a TXT record is 4,000 characters. TXT record values are case-sensitive.
How to fix too many included lookups for SPF records?
How to Solve DNS Lookup Limit of 10 for SPF records. You can actually do this easily yourself with your own DNS server, but you may need to update the record from time to time. Let’s take xero.com as a typical example. The general suggestion is to add “include:xero.com” to your own SPF record.
What does it mean to have too many DNS lookups in SPF?
The RFC Specification Document RFC7208 specifies that the number of mechanisms and modifiers that do DNS lookups should not exceed 10 per SPF check. Generally, the reckless use of the “include” or the “redirect” modifier in an SPF record can result in the DNS lookups going over the 10-limit, thereby causing email deliverability issues.
Can a SPF record be longer than 255 characters?
The total length of the record however cannot be longer than 255 characters. If you need to create a record that exceeds the maximum of 255 characters, you will have to create multiple SPF records by adding them to subdomains which you include in the main domain record. This is shown in the example below: What does ‘Maximum lookups exceeded’ mean?
Can you add multiple sources to a SPF record?
You can add multiple sources to an SPF record. The total length of the record however cannot be longer than 255 characters. If you need to create a record that exceeds the maximum of 255 characters, you will have to create multiple SPF records by adding them to subdomains which you include in the main domain record.