Email · Definition
DKIM
DomainKeys Identified Mail attaches a domain-associated cryptographic signature that receiving systems can verify using DNS.
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20 definitions · Website glossary
Email,
explained.
Understand mailboxes, message transport, authentication, and delivery evidence.
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Email20
20 terms available
Email · Definition
DMARC
An email authentication policy and reporting mechanism that relates SPF or DKIM authentication to the visible From domain through alignment.
Understand the termEmail · Definition
Email alias
An alternate email address that delivers messages to another address or mailbox according to the mail service's configuration.
Understand the termEmail · Definition
Email bounce
A delivery failure notification generated when a message cannot be delivered as expected.
Understand the termEmail · Definition
Email client
Software used to compose, send, receive, and organize email through configured accounts.
Understand the termEmail · Definition
Email deliverability
The practical ability of legitimate mail to reach its intended destination, including acceptance and placement decisions by receiving systems.
Understand the termEmail · Definition
Email forwarding
A mail-routing arrangement that passes received messages to another email address.
Understand the termEmail · Definition
Email header
A structured field in a message carrying information such as its sender, recipient, subject, or transport history.
Understand the termEmail · Definition
Email spoofing
The use of falsified sender information to make an email appear to originate from someone else.
Understand the termEmail · Definition
IMAP
Internet Message Access Protocol lets clients access and manage messages held on a mail server.
Understand the termEmail · Definition
Mailbox
A storage destination for messages associated with an email account.
Understand the termEmail · Definition
Mailing list
A managed group of email recipients served through a list address or sending system.
Understand the termEmail · Definition
Message-ID
A message header field intended to identify a particular version of an email message.
Understand the termEmail · Definition
POP3
Post Office Protocol version 3 is a protocol for retrieving messages from a server mailbox.
Understand the termEmail · Definition
Reverse DNS
A lookup that maps an IP address to a name using the reverse DNS namespace, commonly through PTR records.
Understand the termEmail · Definition
SMTP
Simple Mail Transfer Protocol is used to submit and transfer email between systems.
Understand the termEmail · Definition
SMTP status code
A server reply code describing the result of a step in an SMTP exchange.
Understand the termEmail · Definition
SPF
Sender Policy Framework lets a domain publish which senders are authorized for the envelope-from or HELO identity used in mail transport.
Understand the termEmail · Definition
Transactional email
A message triggered by a specific action or service event, such as an account request or order update.
Understand the termEmail · Definition
Webmail
An email application accessed through a web browser.
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Where should I start with the Email glossary?
Start with mailbox and sending concepts, then connect authentication and message evidence to delivery questions.
- Mailbox: A storage destination for messages associated with an email account.
- SMTP: Simple Mail Transfer Protocol is used to submit and transfer email between systems.
- Email header: A structured field in a message carrying information such as its sender, recipient, subject, or transport history.
Which terms help me investigate email authentication and delivery?
- SPF: Sender Policy Framework lets a domain publish which senders are authorized for the envelope-from or HELO identity used in mail transport.
- DMARC: An email authentication policy and reporting mechanism that relates SPF or DKIM authentication to the visible From domain through alignment.
- Email bounce: A delivery failure notification generated when a message cannot be delivered as expected.
Which practical guides build on the Email terms?
- Inventory email senders before changing authentication: Find the systems legitimately sending under your domain before adjusting SPF, DKIM, or DMARC configuration and enforcement.
- Trace a missing business email: Build a short evidence trail from the sending system to the receiving mailbox before changing unrelated DNS or repeatedly resending a message.