There’s been a gentle bit of uproar recently about ICANN finally beginning the process of rolling out support for internationalized domain names (IDN) at the DNS root and the effect that may have on email senders. Even if you haven’t noticed the uproar, it’s still a subject you probably want to be familiar with if you’re sending email. What are internationalised domain...
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 a particular IP address in a given time period to quite a low level, as low as 1000 emails per hour per IP address...
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 possible to set up multiple smarthosts behind a single IP address using a proxy server or reverse load balancer, and...
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 based token, right now the main key that is used to track reputation is the sending IP address. If...
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 customer, because they might be useful for spreading load and it would provide...
IP addresses aren’t an unlimited resource, not on the current version of the Internet anyway. There are only a limited number of them and, while some of the doom and gloom proclamations about us running out in the next year or two may be exaggerated, we are running low on them and should be conserving them where we can. An ISP can’t create new IP addresses from whole cloth. Instead...
What do you do when you have a potential customers name and address, but know nothing else about them? You’d really like to be able to send them some targeted marketing, ideally via email. You send them a good old-fashioned letter asking them to volunteer more contact information and answers to a bunch of business classification questions – “What industry are you in?”...
Spamhaus announced today that they are rolling out a new system to detect snowshoe spammers. What is a snowshoe spammer? Snowshoe spammers send spam not from compromised servers or botnets, but from large numbers of IP addresses that they are using legitimately. They try to stay below the radar of spam filters, and so get their unwanted email through to the inbox, by looking like a lot of little...
I see a lot of requests for help with some sort of delivery problem, sent to me as an individual, sent to Laura as part of a consulting relationship, sent to ISPs, sent to organizations running blacklists or sent to industry mailing lists, both public and private. Some of them could be done better. OK, most of them could be done better, some of them could be done a lot better. Here’s some...
As promised last week, here are some actual recommendations for handling email addresses. First some things to check when capturing an email address from a user, or when importing a list. These will exclude some legitimate email addresses, but not any that anyone is likely to actually be using. And they’ll allow in some email addresses that are technically not legal, by erring on the side...
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