Update README.md

This commit is contained in:
nicobo 2023-06-22 00:29:34 +02:00 committed by GitHub
parent 4c36241841
commit 79004691fb
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23

View file

@ -1,2 +1,19 @@
# gandi-spf-flatten
Flatten SPF records with Gandi LiveDNS API
## About SPF
This article describes the problem : https://smalltechstack.com/blog/flattening-your-spf-record
There are (were ?) some free online services (e.g. https://dmarcly.com/blog/spf-permerror-too-many-dns-lookups-when-spf-record-exceeds-10-dns-lookup-limit) but apparently you have to register one account different per domain, and I've tried but never received the confirmation email...
## Example
python gandi-flatten-spf.py -d mydomain.com -e _spf.mailfence.com _spf.google.com _spf.mail.yahoo.com _mailcust.gandi.net _spf.protonmail.ch -l DEBUG
Run without arguments to show the full syntax (including how to pass your Gandi API key).
Put in a *cron* to run on a regular basis and check if there were any change in the IP addresses of the email providers.
Without flattening, the 5 email providers from this example would produce 12 DNS requests, out of maximum 10 allowed.