ESP Finder

Discover the software used
to send any email campaign.

Curious which email service provider (ESP) was used to send the marketing emails in your inbox? Just forward them to esp@sendview.io and we’ll instantly reply with the answer. Best of all, it's free.

ESP Finder can identify over 140 ESPs and is 100% free.
Just forward any email to:
esp@sendview.io

Most Analyzed ESPs

We can currently identify over 140 ESPs and we're always adding new ones, but if we can't identify a specific ESP they won't show up on the list.
ESP Name % of Total Chart
    MailChimp     20.3%
    Salesforce     14.7%
    Acoustic     6.1%
    Responsys     5.8%
    ConvertKit     4.5%
    Klaviyo     4.3%
    Braze     3.6%
    HubSpot     3.2%
    Sparkpost     3.2%
    Bronto     2.5%
    Listrak     2.5%
    ActiveCampaign     2.3%
    Constant Contact     2.2%
    Emarsys     2.1%
    Iterable     2.1%
    EmailOctopus     2.0%
    CampaignMonitor     1.7%
    Mapp     1.5%
    Sailthru     1.0%
    All In     0.8%
    Cordial     0.8%
    Dotmailer     0.8%
    Omnisend     0.7%
    Mailjet     0.6%
    Pardot     0.6%
    Drip     0.6%
    Substack     0.6%
    Epsilon     0.6%
    AWeber     0.6%
    MailerLite     0.5%
    Marketo     0.5%
    SendinBlue     0.5%
    Customer.io     0.4%
    Infusionsoft     0.4%
    TravelClick     0.4%
    Intercom     0.3%
    Eloqua     0.3%
    Sendy     0.3%
    Maropost     0.2%
    Shopify     0.2%
    dotdigital     0.2%
    Acy Mailing     0.2%
    GetResponse     0.2%
    IBM     0.2%
    Emfluence     0.2%
    Cheetah     0.2%
    Navis     0.2%
    Quick18     0.1%
    Cendyn     0.1%
    Emma     0.1%