Instead of individual IP addresses, you can also specify IP address ranges using CIDR notation, for example ip4:192.168.0.1/26. Use include: statements to add domains as legitimate senders. For example, any custom domain with mailboxes in Microsoft 365 requires the value include:s...
An SPF record has more than just an IP address. It also instructs the recipient server on what to do if the sender IP doesn’t match the list of authorised IP addresses. Because IP addresses can be IPv4 or IPv6, you can define both versions in an SPF record. Each email message conta...
this can sometimes happen even if an email fails an SPF check depending on the receiving ISP (which makes the final decision). SPF's shortcoming has since been fixed by DMARC, a newer standard that addresses the problem by authenticating...
You can use the Approved IP/IP Blocks option to allow IP addresses or IP ranges (blocks of IPs), manage the include SPF list, and the “all” qualifier. Although an SPF record alone is not enough to entirely prevent email abuse, it is an essential component of your domain’s email ...
If you host your own mail servers, you may need to specify the IP addresses of your mail servers in CIDR notation along with other providers. That would look like this: v=spf1 a ip4:12.34.56.78/28 include:acmeemailmarketing.com ~all ...
EasyDMARC.comis another website with a simple Online SPF Record Checker. This simple tool takes the domain URL as an input and validates the SPF record for the same. In the output, it performs multiple lookups on the domains. This includes a list of IP addresses that are associated with ...
When receiving an email, a mail server can check the IP addresses in the SPF record. If the IP address in the email header isn't listed in the SPF record, the email may be considered illegitimate and may be rejected. How does SPF authentication work? The SPF TXT record is a DNS ...
By clearly specifying which IP addresses can send emails, you reduce the risk of email spoofing and phishing attacks on your domain. It also ensures that emails from your domain are less likely to be marked as spam. Example: v=spf1 ip4:192.0.2.1 ip4:198.51.100.0/24 -all ...
domain-name.com ip-address For example, if you own domain name example.com, your SPF record might look like this: example.com 192.0.2.53 What is Shopify SPF Records? Shopifystores all its customers’ email addresses in a secure server-side file called the “Shopify SPF Record.” This ensur...
Common SPF syntax errors are: Mechanisms that perform DNS lookups (mx, a, ptr, exists, redirect, include) contain text rather than domains or hostnames Mechanisms contain a numerical value, when they require a domain or hostname Format of IP addresses for ip4 and ip6 mechanisms is incorrect...