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Tag: troubleshooting

Troubleshooting and codes

Microsoft is still in the process of rolling out new mail servers. One thing that is new about these is some new codes on their error messages. This has led to questions and speculations as to what is going on. host outlook-com.olc.protection.outlook.com [104.47.9.33] said: 550 5.7.1 Unfortunately, messages from [10.10.01.01] weren’t sent. Please contact your […]

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Troubleshooting delivery is hard, but doable

Even for those of us who’ve been around for a while, and who have a lot of experience troubleshooting delivery problems things are getting harder. It used to be we could identify some thing about an email and if that thing was removed then the email would get to the inbox. Often this was a domain […]

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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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Where do you accept reports?

One of the things that is most frustrating to me about sending in spam reports is that many ESPs and senders don’t actively monitor their abuse address. A few months ago I talked about getting spam from Dell to multiple email addresses of mine. What I didn’t talk about was how badly broken the ESP […]

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Guide to resolving ISP issues

I often get a chuckle out of watching some people, who are normally on the blocking end of the delivery equation, struggle through their own blocking issues. A recent situation came up on a mailing list where someone who has very vehement opinions about how to approach her particular blocklist for delisting and that the […]

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I’m on a blocklist! HELP!

Recently, an abuse desk rep asked what to do when customers were complaining about being assigned an IP address located on a blocklist. Because not every blocklist actually affects mail delivery it’s helpful to identify if the listing is causing a problem before diving in and trying to resolve the issue. Find out whether mail […]

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Troubleshooting email delivery

Mark Brownlow has a post up explaining how he discovered some problems with delivery at Gmail by digging deeper into his statistics. Mark goes through his thought process including his initial conjecture on what might be causing the problems and then how he looked at the data to see if his supposition fit the data. […]

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Troubleshooting the simple stuff

I was talking with one of my Barry pals recently and was treated to a rant regarding deliverability experts that can’t manage simple things. We’ve been having an ongoing conversation recently about the utterly stupid and annoying questions some senders ask. Last week, I was ranting about a delivery person asking what “5.7.1. Too many […]

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