Authentication and infrastructure
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What is Internet Protocol version 6 (IPv6)?
Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol designed t...
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What is a domain?
Domain names are used to identify one or more IP addresses. They are used in Uniform Resource Ide...
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Can email be sent from IPv6 IP addresses?
Yes, email can be sent from IPv6 IP addresses. Your email server, or Mail Transfer Agent (MTA), ...
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Does Transport Layer Security (TLS) improve deliverability?
At this time, there is no proof that Transport Layer Security (TLS) improves deliverability. Howe...
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What is a host name?
A host name is a name assigned to a computer device which is used to identify the device on a com...
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What is a Canonical Name (CNAME) record?
A Canonical Name (CNAME) record is a type of Domain Name System (DNS) record used to specify that...
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What is a sub-domain?
A sub-domain, which is also referred to as a child domain, is a domain that is subordinate to a ...
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What is Transport Layer Security (TLS)?
Transport Layer Security (TLS) is a protocol that ensures that the communication between two serv...
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What is a Reply-To address?
A Reply-To address is the email address that receives messages sent from those who select Reply i...
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What are the different types of DMARC policies?
There are three different types of Domain-based Message Authentication Reporting and Conformance ...
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How many IPv6 IP addresses are there?
IPv6 uses a 128-bit address which allows for 2128 , or approximately 3.4 x 1038 addresses. 3.4 x ...
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What is an AAAA record?
An AAAA record, also known as a quad A record, is a type of Domain Name System (DNS) record that ...
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What is the Domain Name System (DNS)?
The Domain Name System (DNS) is the protocol computer networks use to identify domain names and t...
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What is infrastructure?
Infrastructure is the hardware and software used to deploy your emails or to have your emails dep...
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What do I need to know about sending from shared and dedicated IPs?
An important decision you have to make as an email marketer is whether to send your email from de...
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What is the d= field in DomainKeys Identified Mail (DKIM)?
The d= field in DomainKeys Identified Mail (DKIM) is the domain of the entity signing the email m...
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What is FCrDNS and what are the requirements?
Forward Confirmed Reverse DNS (FCrDNS) is a DNS technical configuration that shows a relationship...
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What are X-headers?
X-headers are email headers that are added into the email in addition to the standard headers, su...
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What is rDNS?
The reverse Domain Name System (rDNS) is a protocol used to translate the sending server IP addre...
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What is a shared IP address?
A shared IP address is one that is used by more than one company to send email. It is typically o...
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What is a dedicated server?
A dedicated server is a server that is used by only one sender. A dedicated server performs bett...
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What are the different SPF record authorization types?
Sender Policy Framework (SPF) records use authorization type statements to tell mailbox providers...
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What is a static Internet Protocol (IP) address?
A static Internet Protocol (IP) address is an IP address that does not change once it is assigne...
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What is an Internet Protocol (IP) address?
An Internet Protocol (IP) address is a unique string of numbers, separated by periods, that is as...
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What is a Simple Mail Transfer Protocol (SMTP) gateway?
A Simple Mail Transfer Protocol (SMTP) gateway (aka gateway) connects two systems involved with t...
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How can I avoid SPF failures if I am reaching the DNS lookup limit?
The SPF specification limits the number of DNS lookups to 10. This limit helps reduce the amount ...
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What is an A record?
An A record is a type of Domain Name System (DNS) record that is used to point a domain or sub-do...
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What is a dynamic Internet Protocol (IP) address?
Dynamic Internet Protocol (IP) addresses are frequently changing IP addresses that are assigned b...
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How to set up SPF
Sender Policy Framework (SPF) is an email authentication protocol that allows the owner of a doma...
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What is backscatter?
Backscatter is auto-generated email replies to an email address who didn't originally send an ema...