General Information

SPF Flattening
It is very common for organizations, when constructing or modifying their SPF record, to run up against the 10 DNS lookup limit. This limitation restricts t...
Mon, 6 Apr, 2020 at 11:06 AM
What to do about Forwards
The question sometimes arises from organizations as to what can be done to ‘fix’ emails that fail authentication when going through a forward. The short ans...
Mon, 6 Apr, 2020 at 11:12 AM
What are Known Forwarders?
  Known forwarders are third party systems that are known to do automated forwarding of emails. Known Forwarders are systems that Helios knows about and...
Mon, 6 Apr, 2020 at 11:13 AM
Legal Characters in DNS
The Domain Name System consists of domain names, as the name suggests. The DNS standards, as updated in RFC 2181, clarifies that there are only two restrict...
Mon, 6 Apr, 2020 at 11:18 AM
Why is is safe to point SPF/DKIM/DMARC to Valimail?
Summary Enforce does not host your entire DNS. Enforce only hosts SPF, DKIM and DMARC records after a one time change to the customer DNS to allow this t...
Mon, 6 Apr, 2020 at 12:37 PM
How does DKIM work?
DKIM is an internet standard that is one of the two ways you can authenticate emails for the purposes of DMARC. It can be used to prove not only that an ema...
Mon, 6 Apr, 2020 at 12:29 PM
What are Forwards?
Forwarded emails are occasionally brought up as a question in conversations with customers. Forwarding is a very small percentage of emails that are sent. W...
Tue, 5 May, 2020 at 4:17 PM
DMARC Alignment
In order for an email to pass DMARC, it must pass authentication with either SPF or DKIM in an aligned way. Alignment is defined as follows: SPF In ord...
Mon, 29 Jun, 2020 at 10:13 AM
DMARC - Strict vs Relaxed alignment
The DMARC standard enables a domain owner to allow relaxed alignment or to require strict alignment. Note that there is no discernible increase in protectio...
Mon, 29 Jun, 2020 at 11:22 AM