{"id":2149,"date":"2017-08-21T00:00:00","date_gmt":"2017-08-21T00:00:00","guid":{"rendered":"https:\/\/www.mailboxvalidator.com\/resources3\/articles\/how-does-mailboxvalidator-work\/"},"modified":"2026-07-31T10:08:16","modified_gmt":"2026-07-31T10:08:16","password":"","slug":"how-does-mailboxvalidator-work","status":"publish","type":"docs","link":"https:\/\/www.mailboxvalidator.com\/resources\/articles\/how-does-mailboxvalidator-work\/","title":{"rendered":"How does MailboxValidator work?"},"content":{"rendered":"\n
\"How-does-MailboxValidator-work\"<\/a><\/figure>\n\n\n\n

<\/p>\n\n\n\n

The Complete Guide to Email List Validation<\/h2>\n\n\n\n

MailboxValidator is a highly intuitive, easy-to-use email address validation service. Users can quickly verify a single email address or perform bulk validation on large subscriber lists.<\/p>\n\n\n\n

Using an enterprise email address verifier significantly lowers your overall digital marketing campaign costs. After completing the verification process, your database will contain far fewer stale email addresses.<\/p>\n\n\n\n

Consequently, this data cleanup translates directly into fewer hard bounces. Ultimately, you will achieve superior sender reputation scores across all major inbox providers.<\/p>\n\n\n\n

1. Validating a Single Email Address<\/h2>\n\n\n\n

Single email validation is a straightforward process designed for quick individual lookups.<\/p>\n\n\n\n

    \n
  • The Web Interface:<\/strong> Sign into your user dashboard and select Single Validation<\/strong>. Enter the target email address into the text field, then click the Validate<\/strong> button. Your comprehensive results will appear on screen after a short while.<\/li>\n\n\n\n
  • The Developer API:<\/strong> You can easily integrate this real-time validation directly into your own applications or signup forms. Please visit our dedicated Single Validation API<\/strong> page for technical documentation.<\/li>\n<\/ul>\n\n\n\n

    2. Validating Large Lists of Email Addresses<\/h2>\n\n\n\n

    For massive databases, select the Bulk Validation<\/strong> option located within the same user dashboard. Simply select your subscriber file and press the Upload & Process<\/strong> button.<\/p>\n\n\n\n

    Processing times naturally scale based on the volume of data submitted. For example, a standard list of 500,000 emails takes approximately one full day to complete verification.<\/p>\n\n\n\n

    Supported Upload Formats<\/h3>\n\n\n\n

    Our automated parsing engine accepts two common file structures for bulk processing.<\/p>\n\n\n\n

    Plain Text Files (*.txt):<\/strong> A simple, clean list containing exactly one email address per line.<\/p>\n\n\n\n

    sam@example.net
    james@example.net
    sandra@example.net<\/p>\n\n\n\n

    Comma-Separated Values (*.csv):<\/strong> A multi-column database where our system automatically detects the correct email field.<\/p>\n\n\n\n

    “23234”,”James Warner”,”james@example.net”,”California”
    “42133”,”Sandra Lim”,”sandra@example.net”,”New York”
    “62134”,”Samuel Bishop”,”sam@example.net”,”Washington”<\/p>\n\n\n\n

    Once the validation concludes, the system transmits an automated notification email. You can then log back into the portal to view the data or download the full CSV report.<\/p>\n\n\n\n

    \n

    Note on Processing Queues:<\/strong> All uploaded bulk files enter a systemic processing queue. If your file shows no immediate progress, it is safely waiting its turn. Rest assured that our platform will process your file in due time.<\/p>\n<\/blockquote>\n\n\n\n

    3. Understanding Your Email Validation Results<\/h2>\n\n\n\n

    Your exported CSV result file contains several specific boolean attributes. Review the definitions below to interpret your data accurately:<\/p>\n\n\n\n

    Field Name<\/strong><\/td>Data Type<\/strong><\/td>Description<\/strong><\/td><\/tr><\/thead>
    domain<\/strong><\/td>String<\/td>The specific domain portion extracted from the email address.<\/td><\/tr>
    is_free<\/strong><\/td>Boolean<\/td>Indicates if the account belongs to a free provider like Gmail.<\/td><\/tr>
    is_syntax<\/strong><\/td>Boolean<\/td>Confirms whether the email address format complies with RFC standards.<\/td><\/tr>
    is_domain<\/strong><\/td>Boolean<\/td>Verifies the existence of valid MX records in the domain’s DNS entries.<\/td><\/tr>
    is_smtp<\/strong><\/td>Boolean<\/td>Confirms if the designated mail servers actively respond to network connections.<\/td><\/tr>
    is_verified<\/strong><\/td>Boolean<\/td>Indicates if the remote mail server confirms the mailbox actually exists.<\/td><\/tr>
    is_server_down<\/strong><\/td>Boolean<\/td>Identifies whether the target mail server is currently unresponsive.<\/td><\/tr>
    is_greylisted<\/strong><\/td>Boolean<\/td>Notes if the server uses greylisting protocols requiring a delayed secondary attempt.<\/td><\/tr>
    is_disposable<\/strong><\/td>Boolean<\/td>Flags temporary email addresses created through burner inbox providers.<\/td><\/tr>
    is_suppressed<\/strong><\/td>Boolean<\/td>Indicates whether the email matches internal blacklists or suppression files.<\/td><\/tr>
    is_role<\/strong><\/td>Boolean<\/td>Flags administrative or functional email addresses like admin@ or support@.<\/td><\/tr>
    is_high_risk<\/strong><\/td>Boolean<\/td>Identifies if the address contains known high-risk or spam-associated keywords.<\/td><\/tr>
    is_catchall<\/strong><\/td>Boolean<\/td>Confirms if the domain utilizes a catch-all configuration for all incoming mail.<\/td><\/tr>
    mailboxvalidator_score<\/strong><\/td>Float<\/td>Reputation rating where >0.70 is Good, >0.40 is Fair, and \u22640.40 is Poor.<\/td><\/tr>
    time_taken<\/strong><\/td>Float<\/td>The total duration in seconds required to process the specific address.<\/td><\/tr>
    status<\/strong><\/td>Boolean<\/td>The final programmatic verdict stating whether the email address is valid.<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

    The Complete Guide to Email List Validation MailboxValidator is a highly intuitive, easy-to-use email address validation service. Users can quickly […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"doc_category":[67],"doc_tag":[],"class_list":["post-2149","docs","type-docs","status-publish","hentry","doc_category-mailboxvalidator-articles"],"year_month":"2026-08","word_count":575,"total_views":"37","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"mbv_editor","author_nicename":"mbv_editor","author_url":"https:\/\/www.mailboxvalidator.com\/resources\/author\/mbv_editor\/"},"doc_category_info":[{"term_name":"MailboxValidator Articles","term_url":"https:\/\/www.mailboxvalidator.com\/resources\/article-categories\/mailboxvalidator-articles\/"}],"doc_tag_info":[],"yoast_head":"\nHow does MailboxValidator work? -<\/title>\n<meta name=\"description\" content=\"Wonder how you can benefit from MailboxValidator to clean your email list? 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