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Tag: ip addresses

IP Address reputation primer

There has been a lot of recent discussion and questions about reputation, content and delivery. I started to answer some of them, and then realized there weren’t any basic reference documents I could refer to when explaining the interaction. So I decided to write some. This first post is about IP address reputation with some […]

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Yes, we have no IP addresses, we have no addresses today

We’ve just about run out of the Internet equivalent of a natural resource – IP addresses. ICANN allocated the last couple of blocks of general usage IPv4 addresses to APNIC earlier today. There are just five usable blocks of addresses left, and they’re reserved by IANA policy for the final phase of IPv4 exhaustion, one […]

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My ISP might get blacklisted

The last of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need multiple IP addresses in different locations so as to provide redundancy against blacklisting of my ISP Why this is right If you think that your email is likely to be […]

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I want to avoid network outages

Number six of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need multiple IP addresses in different locations to provide redundancy against network outages Why this is right If all your traffic goes out via a single ISP and your connection to […]

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I need to dodge filters

Number five of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need multiple IP addresses per customer so as to manage filtering issues Why this is right If you have, for example, three dedicated IP addresses per customer and one of those […]

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I need to deliver my mail fast

Number four of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need multiple IP addresses per customer so that that customer can deliver mail in a timely manner Why this is right If your customer needs to deliver a message to 100,000 […]

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I need IP addresses to avoid throttling

Number three of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need many IP addresses so that I can work around ISP throttling limits Why this is right: There are ISPs that limit the number of emails that can be sent from […]

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I need IP addresses to handle the volume

Number two of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need lots of IP addresses so my MTAs can handle the volume of mail sent Why this is right One IP address per outbound smarthost is a sensible minimum. It is […]

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I need IP addresses for reputation

Number one of seven in our occasional series on why ESPs need, or don’t need, lots of IP addresses to send mail properly. I need at least one IP address per customer, to handle IP based reputation Why this is right While DKIM is gradually moving the main key for reputation tracking to a domain […]

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Why do you need so many IP addresses (part 2)?

In my last post I discussed the background as to why an ISP will require their users to use their IP address allocation efficiently. I also mentioned in passing that I’d discussed ESP address allocation with both ESPs and ISPs recently. The ESP was talking about assigning a couple of dozen IP addresses to each […]

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