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  3. Email Glossary

Email Glossary

  • What is a feedback loop (FBL)?

    A feedback loop (FBL) is a service offered by mailbox providers, in which they provide you with c...

  • 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...

  • What is a gateway filter?

    A gateway filter is a spam filter that mailbox providers and corporate domains use on the inbound...

  • What is a hard bounce?

    A hard bounce is an email sent to an invalid, blocked, or nonexistent email account. Typically, h...

  • What is a hash or checksum?

    A hash is the outcome of running an algorithm on data, called a hash function. The hash function ...

  • 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...

  • What is a list validation service?

    List validation services identify whether email addresses on your list are valid or invalid.  By ...

  • What is a Mail Delivery Agent (MDA)?

    A Mail Delivery Agent (MDA) is a computer program that receives email from a Mail Transfer Agent ...

  • 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...

  • 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...

  • 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...

  • What is a mailbox provider (MBP)?

    A mailbox provider is an organization that provides users with email accounts, and accepts and de...

  • 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...

  • What is a Multipurpose Internet Mail Extensions (MIME) multipart message?

    A Multipurpose Internet Mail Extensions (MIME) multipart message is defined through the MIME stan...

  • What is a netblock?

    A netblock is a range of consecutive IP addresses, for instance: 196.25.0.0-196.25.255.255.  Netb...

  • 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...

  • What is a policy block?

    A policy block is when email from your IP address or domain is rejected by a mailbox provider in...

  • What is a postmaster?

    A postmaster is the person who manages mail servers at an organization or mailbox provider. A pos...

  • What is a preference center?

    A preference center is a tool that allows your email subscribers to easily change their own subsc...

  • 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 ...

  • What is a preview pane?

    A preview pane is a setting in desktop and webmail email clients that allows subscribers to previ...

  • What is a pristine spam trap?

    Pristine spam traps, also referred to as true traps or honeypots, are email addresses created sol...

  • What is a privacy policy?

    A privacy policy is a document that describes the ways a company gathers, uses, and manages custo...

  • What is a queue?

    A queue is a storage location on an email server for email waiting to be processed. Queuing can ...

  • What is a rate limit?

    A rate limit is a maximum volume of email an Internet Service Provider allows to be received from...

  • What is a re-engagement campaign?

    A re-engagement campaign is an email campaign sent to inactive subscribers, or non-responders, in...

  • What is a recycled spam trap?

    Recycled spam traps, sometimes called re-purposed spam traps, are addresses that were at one time...

  • What is a Reply-To address?

    When you send an email to a subscriber and they click 'Reply', the reply message is typically sen...

  • What is a Request for Comments (RFC)?

    A Request for Comments (RFC) is a formal document developed by a committee of the Internet Engin...

  • What is a retry?

    A retry is a subsequent attempt to deliver an email message that has previously failed. Retries t...

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