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I am using expressionengine 2.7.3 with multiple site manager. 

I have one site where I have successfully set up an email contact form using the <exp:mail> tag.  I have tried to setup another site with a contact form using the <exp:mail> tag and it fails with this message

The following errors were encountered
◾The action you have requested is invalid.

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I have tried a emailtest.php on the server and am able to send mail fine. The tools | communicate feature works fine.

I am at a lost as to what could be the issue.  I don’t recall having to do anything special to get the first site to work. 

I’ve been through the settings comparing both sites and can find nothing different.

I think it was around 2.7.3 that EE introduced the need for a hidden field for some older forms to comply with some new security changes. When it was first rolled out, the error a form submission could cause wasn’t very descriptive and might have been what you are seeing.

<input type="hidden" name="XID" value="{XID_HASH}" />

Try adding this hidden field to your form if it’s not already in there.

That might be what you are running into.

Yes I already tried that.  I can’t figure out why it works on one site and not the other when both are hosted on the same expressionengine installation.

can you test using the stock email form code - http://ellislab.com/expressionengine/user-guide/add-ons/email/contact_form.html - remembere to change the recipients parameter…

Yes I have tried that, I get the same result.

Have you got any template caching going on the page that the form appears on? If you have disable caching and try that…

Template caching is turned off.