Did you manually modify anything in your Postfix configuration? NOT
Did you create the domain in ISPConfig? YES
Did you create the email account in ISPConfig? YES
Did you create mail transports (I think it's called email routing in ISPConfig)? YES, continued
the problem is that emails do not arrive and leave these errors mentioned in the first message in this thread.
but if it comes off if all options spam. seems likely, but delay, spam and all.
but when I enable the option to filter spam, not received any mail.
bounces when I send an email with Undelivered Mail Returned to Sender.
that may be happening. is not a bug?