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Did you telnet from one of those hosts?
Sorry, it was a stupid typing error in acl section.
Just for testing: Is it possible to accept mails from everywere ?
Sure.
begin acl
acl_check_rcpt:
accept
or even
acl_smtp_rcpt = accept
further up.
But do not do it for more than a few minutes. Otherwise your host will
become an open relay for the spammers.
Many thank's for all the hints.
Pedro