smtp 550: Sender verify failed with incorrect reverse DNS record

Here’s an interesting post from Mark Wilson which he’s allowed me to reproduce here.  Often Exchange and messaging problems are not the fault of the application, but often an underlying issue further down the stack.  DNS is often the culprit too, so Mark’s article is useful when troubleshooting smtp 550 errors. You can read his article here..  

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Sender verify failed with incorrect reverse DNS record

Mark Wilson What a week! Switching hosting providers, setting up a new content management system for this blog (more on that as soon as it’s ready) and all at the same time as suffering e-mail problems as, since the middle of the week, every e-mail that I’ve sent to a particular contact has bounced back…

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Creating Subject Alternative Name Certificates with Certificate Server

Brian Reid has written an interesting piece about using Powershell to create certificate requests for other web sites that can be uploaded to Certificate Server.  This allows you to have a certificate for more than one domain name.  Brian uses Exchange 2007 extensions to Powershell to achieve this.  It’s yet another example of how powerful…

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Creating Subject Alternative Name Certificates with Microsoft Certificate Server

Brian Reid    A new feature in digital certificates is the Subject Alternative Name property. This allows you to have a certificate for more than one URI (i.e. www.c7solutions.com and www.c7solutions.co.uk) in the same certificate. It also means that in web servers such as IIS you can bind this certificate to the site and use…

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