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Deliverability

ISP (Internet Service Provider)

An ISP (Internet Service Provider) delivers internet access and often email services; in email marketing, ISPs play a key role in spam filtering and deliverability.

An Internet Service Provider (ISP) is a company that provides internet access to individuals and businesses. In the context of email deliverability, ISPs often also operate the mail servers (e.g., Comcast, AT&T, Verizon) that receive emails on behalf of their users. ISPs employ sophisticated spam filters and reputation systems to protect users from unwanted mail. Email senders must maintain good sending practices — including proper SPF, DKIM, and DMARC configuration — to ensure their messages pass ISP filters and reach the inbox.
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