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I am following this SF VF email example.

They have the relatedToType="Account" and their <apex:repeat var="cx" value="{!relatedTo.Cases}"> references Cases which should loop through the Cases related to Account - Being a one to many relationship. I can make this work fine.

When I change the relatedToType="Contact" and my <apex:repeat var="cx" value="{!relatedTo.MyCustomObject__r}"> which is also a one to many relationship I get the following error on trying to save the template:

Error: Invalid field MyCustomObject__r for SObject Contact

I have also tried __c but with the same error.

Any ideas?

UPDATE:

The accepted answer below (and comments) worked for me. I was focusing on the related 'object' not the 'field' that actually related them both together.

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    Get the child relationship name and append __r there . – Mohith Shrivastava Jan 8 '16 at 12:39
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    The child relationship name is usually plural (unless you've manually changed it), and you have to use __r. So use {!relatedTo.MyCustomObjects__r}. You can see the child relationship name, by going to the lookup field, it's at the bottom left. – rael_kid Jan 8 '16 at 12:42
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The child relationship name has to be observed and __r needs to be appended .

enter image description here

In your set up menu navigate to Object > field > and observe child relationship name

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