I realised that I could have spent the last twenty years putting all my tech knowledge online. Well, I didn't, but as they say, the best time to plant trees is 20 years ago, the second best time is now. So here's all the random programming stuff I've come across that might be helpful. Note: this isn't really questions and answers - more just answers from me!

Why is the "SendUsing" configuration value invalid?

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Getting CDO.Message.1 error '80040220' The "SendUsing" configuration value is invalid. When sending mail?

In Classic ASP and perhaps others you might run across this, it was driving me insane as it worked fine on other sites, but not on this particular one.

We were running our sites on Amazon AWS, Windows Server 2008 R2.


In IIS 7:

- Right click application pools
- Find website
- Right click and choose advanced settings
- Change identity from 'applicationpoolidentity' to 'Network Service'
- Try the code again

This worked for me. It was mentioned on a form thread somewhere but didn't seem to be the solution in that case.
asked Mar 8, 2018 in Classic ASP by Ralpharama (380 points)

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