I'm thinking about how it works...
I use the email firstname.lastname@example.org
and put in some aliases, lets say fritz/heinz/karl.
First, for ISPConfig, is it correct then, that email@example.com
will collect firstname.lastname@example.org
Second, if I don't use catch all for this account but this is my only mailadress for the domain firma.de...would other mails like email@example.com
automatically get bounced or would they stay somewhere until there is an catch all account that collects them?
Third, would it then be enough to put an anti-spam config like the following into main.cf to get rid of unused mails?
bounce_template_file = /etc/postfix/bounce.cf
delay_warning_time = 30m
bounce_queue_lifetime = 3d
maximal_queue_lifetime = 3d
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_helo_required = yes
disable_vrfy_command = yes
strict_rfc821_envelopes = yes
invalid_hostname_reject_code = 554
multi_recipient_bounce_reject_code = 554
non_fqdn_reject_code = 554
relay_domains_reject_code = 554
unknown_address_reject_code = 554
unknown_client_reject_code = 554
unknown_hostname_reject_code = 554
unknown_local_recipient_reject_code = 554
unknown_relay_recipient_reject_code = 554
unknown_sender_reject_code = 554
unknown_virtual_alias_reject_code = 554
unknown_virtual_mailbox_reject_code = 554
unverified_recipient_reject_code = 554
unverified_sender_reject_code = 554