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(550): 5.4.6 Email was forwarded too many times. one, I would look in to the final destination that you're trying to forward your message(s) to.DDWD(521): 5.3.0 Upstream error, please check on the Activity Log (https://dash.cloudflare.com/?to=/:account/:zone/email/routing/overview), and not only in a bounce message, it could also sound like you have a loop, where it's bouncing between different Cloudflare Email Routing domain.a@cfer1.example.com -> b@cfer2.example.com -> c@cfer3.example.com -> d@cfer4.example.com -> example@example.netd@cfer4, to find the actual rejection message, that the mail server for example@example.net rejected you with.(521): 5.3.0 Upstream error, please check in a such scenario.WWDWWDDW
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Dexample.com, ... is the records@example.com on this Plesk screenshotDrecords@example.com?DWDDexample.com.Dexample.com, since example.com's MX are Cluodflare, Cloudflare will re-try over and over, to deliver to itself.WWD@internal.example.com instead.Drecords@example.com forwards to records@internal.example.com, where internal.example.com would be on your Plesk.WWDD
WWWWWDjohn.doe@example.com (and example.com) running on an expensive provider. However, in order to add your secondary @example.net as alias with them, your expensive provider charges $$$ to do that.@example.net, and then pass it's messages over to your already existing john.doe@example.com, at no extra cost. DD(550): 5.4.6 Email was forwarded too many times.(521): 5.3.0 Upstream error, please check(521): 5.3.0 Upstream error, please checka@cfer1.example.comb@cfer2.example.comc@cfer3.example.comd@cfer4.example.comexample@example.netexample@example.netd@cfer4example.comexample.comexample.comexample.comexample.comrecords@example.comrecords@example.comrecords@example.com@internal.example.comrecords@internal.example.cominternal.example.comjohn.doe@example.comjohn.doe@example.com@example.net@example.net