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January 31, 2018

Microsoft using the List-Unsubscribe header

By laura
3 Min read
9 comments
31January

An interesting observation from Brian Curry about how Microsoft is using the List Unsubscribe header in their interface. The short version is that Microsoft is only supporting mailto: links. They’re ignoring any List-Unsubscribe links that are a URL. Here are some screenshots.  When the sender is using a List-Unsubscribe <; header, Microsoft states that there is no information on how to...

November 18, 2015

When did the reject happen?

By laura
3 Min read
6 comments
18November

Earlier today I approved a comment from Mike on a post about problems at AOL from 2012. The part of the comment that caught my attention: SMTP error from remote mail server after end of data: 521 5.2.1 : AOL will not accept delivery of this message. Mike also mentioned his IP reputation is good, when he checks at AOL so he doesn’t understand why mail is being blocked. I think the big clue...

August 20, 2013

"Blocked for Bot-like Behavior"

By laura
2 Min read
Add comment
20August

An ESP asked about this error message from Hotmail and what to do about it. “Bot-like” behaviour usually means the sending server is doing something that bots also do. It’s not always that they’re spamming, often it’s a technical issue. But the technical problems make the sending server look like a bot, so the ISP is not taking any chances and they’re going to...

April 23, 2012

First step in delivery

By laura
1 Min read
4 comments
23April

Ever trawl through your logs and notice that there is a delivery problem somewhere? I’m sure everyone sending email in any volume has. What’s the first thing you do when you discover a block? A: Decide that something broke on your end and set about trying to figure out what you did to trigger the block. B: Decide that something broke on the ISP end and set about trying to find a human...

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