Email Glossary
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What is a feedback loop (FBL)?
A feedback loop (FBL) is a service offered by mailbox providers, in which they provide you with c...
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What is a Friendly-From name and address?
The Friendly-From name and address are both user-defined names that identify the sender to the su...
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What is a gateway filter?
A gateway filter is a spam filter that mailbox providers and corporate domains use on the inbound...
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What is a hard bounce?
A hard bounce is an email sent to an invalid, blocked, or nonexistent email account. Typically, h...
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What is a hash or checksum?
A hash is the outcome of running an algorithm on data, called a hash function. The hash function ...
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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 list validation service?
List validation services identify whether email addresses on your list are valid or invalid. By ...
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What is a Mail Delivery Agent (MDA)?
A Mail Delivery Agent (MDA) is a computer program that receives email from a Mail Transfer Agent ...
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What is a Mail Exchange (MX) record?
A Mail Exchange (MX) record is a type of resource record in the Domain Name System (DNS) that spe...
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What is a Mail Transfer Agent (MTA)?
A Mail Transfer Agent (MTA), also referred to as a message transfer agent, mail server, or a mail...
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What is a Mail User Agent (MUA)?
A Mail User Agent (MUA), also referred to as an email client, is a computer application that allo...
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What is a mailbox provider (MBP)?
A mailbox provider is an organization that provides users with email accounts, and accepts and de...
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What is a malformed or invalid domain?
A malformed or invalid domain is a domain name located in an email address that has an error in s...
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What is a Multipurpose Internet Mail Extensions (MIME) multipart message?
A Multipurpose Internet Mail Extensions (MIME) multipart message is defined through the MIME stan...
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What is a netblock?
A netblock is a range of consecutive IP addresses, for instance: 196.25.0.0-196.25.255.255. Netb...
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What is a pointer (PTR) record?
A pointer (PTR) record is a type of Domain Name System (DNS) record that resolves an IP address t...
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What is a policy block?
A policy block is when email from your IP address or domain is rejected by a mailbox provider in...
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What is a postmaster?
A postmaster is the person who manages mail servers at an organization or mailbox provider. A pos...
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What is a preference center?
A preference center is a tool that allows your email subscribers to easily change their own subsc...
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What is a preheader or email preheader?
A preheader, which is also referred to as an email preheader, is the string of text that follows ...
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What is a preview pane?
A preview pane is a setting in desktop and webmail email clients that allows subscribers to previ...
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What is a pristine spam trap?
Pristine spam traps, also referred to as true traps or honeypots, are email addresses created sol...
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What is a privacy policy?
A privacy policy is a document that describes the ways a company gathers, uses, and manages custo...
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What is a queue?
A queue is a storage location on an email server for email waiting to be processed. Queuing can ...
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What is a rate limit?
A rate limit is a maximum volume of email an Internet Service Provider allows to be received from...
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What is a re-engagement campaign?
A re-engagement campaign is an email campaign sent to inactive subscribers, or non-responders, in...
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What is a recycled spam trap?
Recycled spam traps, sometimes called re-purposed spam traps, are addresses that were at one time...
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What is a Reply-To address?
When you send an email to a subscriber and they click 'Reply', the reply message is typically sen...
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What is a Request for Comments (RFC)?
A Request for Comments (RFC) is a formal document developed by a committee of the Internet Engin...
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What is a retry?
A retry is a subsequent attempt to deliver an email message that has previously failed. Retries t...