Newsletter Send Echo


yesterday i send a newsletter to a list with 1800 subsribers.

when i press “save and send” there is no echo shown.

From cs cart 3.x.x i know all emailadress will be visible on screen.

In code from csc at 4.2.3 newsletter addon , the echo is still there.

But i isnt shown, why?

By sending the newsletter i get a server error, and now i didnt now, to how many subribers the newsletter was send.

Can anybody help?