Internet Service Provider (ISP)

What is the meaning of Internet Service Provider (ISP)?

ISPs are companies that provide internet access and webmail to users. ISP may also describe all mail clients collectively. ISPs include ATT, Verizon, Comcast, AOL, and Earthlink, among others.

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• MX (Mail eXchanger) Record
• X-header
• Domain Name System (DNS)
• Opt-Out/Unsubscribe
• Attachment
• Deliverability Rate
• SpamCop
• Block