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Tag: filters

Language as filtering criteria

A few months ago I was working on a delivery audit for a client who sends mail in multiple languages. We discovered that the language of an email has a significant delivery impact. The same email in different languages was delivered differently, particularly at Gmail. Emails in a language I don’t normally receive email in were […]

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AHBL Wildcards the Internet

AHBL (Abusive Host Blocking List) is a DNSBL (Domain Name Service Blacklist) that has been available since 2003 and is used by administrators to crowd-source spam sources, open proxies, and open relays.  By collecting the data into a single list, an email system can check this blacklist to determine if a message should be accepted […]

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Email problems are costly

Last week Zulily released their quarterly earnings. Their earnings’ report was disappointing, resulting in a drop in their stock prices. The chairman of the company told reporters on a conference call that part of the reason for the drop in earnings were due to deliverability problems “at a large ISP.” Zulily ran into problems with a […]

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ISP filters are good for marketers

A throwback post from 2010 Attention is a limited resource. Marketing is all about grabbing attention. You can’t run a successful marketing program without first grabbing attention. But attention is a limited resource. There are only so many things a person can remember, focus on or interact with at any one time. In many marketing […]

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Content based filtering

Content filtering is often hard to explain to people, and I’m not sure I’ve yet come up with a good way to explain it. A lot of people think content reputation is about specific words in the message. The traditional content explanation is that words like “Free” or too many exclamation points in the subject line are […]

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Ever changing filtering

One of the ongoing challenges sending email, and managing a high volume outbound mail server is dealing with the ongoing changes in filtering. Filters are not static, nor can they be. As ISPs and filtering companies identify new ways to separate out wanted email from unwanted email, spammers find new ways to make their mail […]

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Delivering to Gmail

Gmail is a challenge for even the best senders these days. With the recent Gmail changes there isn’t any clear fix to getting open rates or inbox delivery back up. Some of it depends on what is causing Gmail to filter the mail. Changing subject lines, from name, from address may get mail back to […]

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Spam filters and mailbox usage

It’s no secret that I run very little in the way of spam filters, and what filters I do run don’t throw away mail, they just shove it into various mailboxes. Looking at my mailboxes currently I have 11216 unread messages in my mail.app junk folder, 10600 unread messages in my work spam assassin folder […]

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Abuse it and lose it

Last week I blogged about the changes at ISPs that make “ISP Relations” harder for many senders. But it’s not just ISPs that are making it a little more difficult to get answers to questions, some spam filtering companies are pulling back on offering support to senders. For instance, Cloudmark sent out an email to […]

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Thoughts on “ISP relations”

I’ve been thinking a lot about the field of ISP relations and what it means and what it actually is. A few years ago the answer was pretty simple. ISP relations is about knowing the right people at ISPs in order to get blocks lifted. The fact that ISPs had staff just to deal with […]

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