The SPF Surveyor is an SPF diagnostic tool that presents a graphical view of SPF records. The graphical view allows people to quickly identify which servers are authorized to send on behalf of a domain. (Note that this diagnostic tool focuses on domain-level authentication and largely ignores the portions of SPF that deal with the local parts of email addresses.)
Access/bookmark this inspection at
Click on nodes to expand.
DNS-querying mechanisms / modifiers to resolve the record
This record is considered broken and can be fixed by reducing the number of DNS-querying mechanisms / modifiers. To learn how to address the "Too many DNS" issue, see
This record utilizes a considerable number of DNS-querying mechanisms / modifiers. Attention should be paid to determine if that number should be reduced.
This record utilizes a small number of DNS-querying mechanisms / modifiers. No fixing is required. If this record is meant to be included by other records, consider reducing the number of DNS-querying mechanisms / modifiers (if possible) to keep total resource consumption low.
This record utilizes no DNS-querying mechanisms / modifiers. There are no efficiency gains to be made in terms of reducing the number of DNS queries.
Learn more about SPF mechanisms / modifiers.
netblocks are authorized
individual IPv4 addresses
Authorized netblocks produce SPF "pass" results (as opposed to "neutral", "fail", or "softfail").
Duplicate netblock authorization
The following netblocks have been authorized more than once. Duplicates usually indicate inefficient records or redundant "include" mechanisms, and should be removed.
The dmarcian SPF Record Flattener rewrites this record by removing duplicate netblocks, collapsing any overlapping netblocks, and using 0 DNS-querying mechanisms / modifiers. Each SPF record is kept to less than 512 bytes to fit into a single UDP packet (assuming no other TXT records are sharing the DNS label).
This approach is considered experimental and should not be used without careful monitoring. By flattening a record, you will not receive changes that come from "include" unless you track them yourself and manually update the record. If you do not have a complete understanding of what this means, do not use this.
NOTE: this approach does not take into account administrative or domain boundaries, and is meant to show that "minified" SPF records are possible. The presence of unusual qualifiers, macros, and creative semantics will likely yield less than optimal results.
Congratulations! Your SPF record is valid.
There is something wrong with your SPF record.
No SPF Record for this domain.