Internal forwarding delay because “”Too many concurrent deliveries for user””

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Hello! We receive thousands of emails daily. We are trying to forward the emails from 6 inboxes into an internal account. The problem is that in moments of high traffic we experience a delay in the forwardings due to “Too many concurrent deliveries for user”. The exact error is like this:

LMTP error after RCPT TO:: 451 4.3.0 Too many concurrent deliveries for user.

We already tried the following actions without…