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ISP (Internet Service Provider)
An ISP or Internet service provider is a company or business that provides many services to customers in relation to accessing, using, or participating in the Internet.
It generally serves as the access point or gateway that provides a customer or user access to everything that is available on the Internet.
What Are ISPs Responsible for?
In simple terms, without an ISP, customers or users wouldn't be able to access the Internet. In other words, they wouldn't be able to shop online, access social media, send email, read blogs, and many more.
In simple terms, without an ISP, customers or users wouldn't be able to access the Internet. In other words, they wouldn't be able to shop online, access social media, send email, read blogs, and many more.
So, ISPs are responsible for making sure that their customers can access the Internet, routing Internet traffic, resolving domain names, and maintaining network infrastructure that makes internet access possible for their customers.
Apart from Internet access, ISPs can also provide services like Internet transit, domain name registration, web hosting, Usenet service, and colocation.
As a result, ISPs are often fall into different classifications depending on the service they provide:
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Access providers
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Mailbox providers
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Hosting ISPs
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Transit ISPs
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Virtual ISPs
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Free ISPs
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Wireless ISPs
Keep in mind, though, that a specific ISP is not necessarily limited to one service and can offer its customers a combination of the services mentioned above.
How Does ISP Relate To Deliverability?
ISPs assign email sender reputation scores to an organization or business that sends email. This is a crucial component of any business' email deliverability.
This is because, the higher the score, the more likely the ISP will be to deliver emails to the inboxes of customers on their network.
Likewise, if the score falls below a certain threshold, the ISP may send the businesses emails to recipients’ spam folders or reject the mail outright. Here, every ISP decides on the factors that it will use to determine sender reputation and how much those factors will contribute to the overall score.
This means that a business could have different reputation scores for different ISPs. Likewise, if a business uses different domain names, each one must have its own sender reputation score.
For this reason, it's important for businesses who rely on email to ensure that their sender reputation score is as high as possible so that their email deliverability is optimized.
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