Juraj Kubelka wrote:

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I am trying to create an issue on https://pharo.fogbugz.com, but it complains about "Please enter a valid email address in the Correspondent field"

I do not see where it should be written.

That is strange. I've never seen that before.  After clicking <New Case> in the bottom left of the sidebar do you have an "Add Fields" list containing Correspondent.  If you add that field to the side bar, what does it contain?
cheers -ben