Authorize senders with SPF
Multiple SPF records
Multiple SPF records are not recommended and may cause delivery and spam classification issues. According to RFC specs, a domain name must not have multiple records that would cause an authorization check to select more than one record.
If you need to authorize more than one mail server for your domain, we recommend that you update your existing SPF record instead of creating multiple records.
v=spf1 ip4:184.108.40.206 ~all
v=spf1 include:_spf.google.com ~all
This text will cause the SPF check to fail because there are multiple records. Instead, add the mail server's IP address before the
~all argument using the format
ip6:address to add the server to your existing SPF record:
v=spf1 ip4:220.127.116.11 include:_spf.google.com ~all
For more details on the SPF format, see Sender Policy Framework.