Hello,

I want to setup a new postfix instance. Receiving/sending emails to/from my
local account basically works. But on sending mails outside from command
line (echo “test mail” | mail -s “test mail” mygoogleacco...@googlemail.com),
I see a bounce to unknown "user mail???", which I don't understand. I
strongly simplied my postfix configuration to the minimum, to eliminate
other malconfiguration issues. Further I rely on postfix's default
configuration and only customize if necessary. Therefore my postfix
main.conf is quite clear.
My host's name is set to mybox.mydomain.tld. DNS A/AAAA records are set to
mydomain.tld and to mybox.mydomain.tld. DNS PTR records for A/AAAA are set
to mybox.mydomain.tld

I'm new to postfix and be very pleased, if anybody could tell me, what's
wrong in my setup and why I get this bounce with dsn 5.1.1 - unknown user:
"mail???" If I shall provide further info, please let me know. Thanks in
advance.

Greetings, Quirin

mail.log:
Jul  5 18:17:14 mybox postfix/cleanup[9668]: 379A77BB15:
message-id=<20140705161714.379a77b...@mybox.mydomain.tld>
Jul  5 18:17:14 mybox postfix/qmgr[9646]: 379A77BB15:
from=<myu...@mydomain.tld>, size=367, nrcpt=2 (queue active)
Jul  5 18:17:14 mybox postfix/local[9670]: 379A77BB15:
to=<mail???@mydomain.tld>, orig_to=<mail???>, relay=local, delay=0.04,
delays=0.02/0.01/0/0.01, dsn=5.1.1, status=bounced (unknown user: "mail???")
Jul  5 18:17:14 mybox postfix/smtp[9671]: 379A77BB15: to=<
mygoogleacco...@googlemail.com>,
relay=gmail-smtp-in.l.google.com[173.194.66.27]:25,
delay=0.56, delays=0.02/0/0.09/0.45, dsn=2.0.0, status=sent (250 2.0.0 OK
1404577034 v16si33366004wie.33 - gsmtp)
Jul  5 18:17:14 mybox postfix/cleanup[9668]: BCFC57BB16:
message-id=<20140705161714.bcfc57b...@mybox.mydomain.tld>
Jul  5 18:17:14 mybox postfix/qmgr[9646]: BCFC57BB16: from=<>, size=2238,
nrcpt=1 (queue active)
Jul  5 18:17:14 mybox postfix/bounce[9672]: 379A77BB15: sender non-delivery
notification: BCFC57BB16
Jul  5 18:17:14 mybox postfix/qmgr[9646]: 379A77BB15: removed
Jul  5 18:17:14 mybox postfix/local[9670]: BCFC57BB16:
to=<myu...@mydomain.tld>, relay=local, delay=0.02, delays=0.02/0/0/0,
dsn=2.0.0, status=sent (delivered to mailbox)
Jul  5 18:17:14 mybox postfix/qmgr[9646]: BCFC57BB16: removed


postconf -n
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
config_directory = /etc/postfix
mydestination = localhost, localhost.$mydomain, $mydomain $myhostname
myorigin = $mydomain
recipient_delimiter = +
sender_canonical_maps = hash:/etc/postfix/sender_canonical
smtp_address_preference = ipv4
smtp_tls_session_cache_database = btree:\${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtpd_tls_cert_file = /etc/ssl/certs/mydomain.pem
smtpd_tls_key_file = /etc/ssl/private/mydomain.key
smtpd_tls_session_cache_database = btree:\${data_directory}/smtpd_scache
smtpd_use_tls = yes

/etc/postfix/sender_canonical
root myu...@mydomain.tld
myuser myu...@mydomain.tld

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