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Whenever I e-mail "root", I want it to be forwarded to root@example.org (instead of a local delivery).

However, I keep getting this:

Feb  9 17:41:54 botmaster postfix/smtp[29969]: B6E0B808F5: to=<root@botmaster.corp.flatturtle.com>, relay=none, delay=0.01, delays=0.01/0/0.01/0, dsn=5.4.6, status=bounced (mail for botmaster.corp.flatturtle.com loops back to myself)

This is my main.cf:

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (by FlatTurtle)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = mx.flatturtle.com
#alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
local_transport = error:local delivery is disabled
mydestination = localhost
relayhost = 
mynetworks = [::ffff:]/104 [::1]/128
#mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
relay_domains = /home/mx/postfix_transport
unknown_local_recipient_reject_code = 550 

smtpd_recipient_restrictions =
        reject_rbl_client sbl-xbl.spamhaus.org,
        check_policy_service unix:private/postgrey,

There are a few ways to disable local delivery, but none of them seem to be working (or at least, I keep getting that message).

dig mx flatturtle.com:

flatturtle.com.     14679   IN  MX  30 mx.flatturtle.com.
flatturtle.com.     14679   IN  MX  10 mail.flatturtle.com.

dig mx.flatturtle.com:

mx.flatturtle.com.          604800  IN  CNAME   mail2.rootspirit.com.
mail2.rootspirit.com.       21600   IN  CNAME   one.rootspirit.com.
one.rootspirit.com.         21600   IN  A

dig mail.flatturtle.com:

mail.flatturtle.com.    444387  IN  CNAME   mail.rootspirit.com.
mail.rootspirit.com.    10265   IN  A

dig flatturtle.com:

flatturtle.com.     14594   IN  A

dig botmaster.corp.flatturtle.com:

botmaster.corp.flatturtle.com. 4680 IN  A
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3 Answers 3

"mail loops back to myself" has only one cause: postfix is sending out mail to a recipient domain that it is responsible for, such as RCPT TO: me@example.org, while $myhostname is the MX for example.org.

There is no configuration to fix this, since it is what you configured.

Add an alias for root to somewhere NOT on your postfix box, such as:

root:  you@other.example.com
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This server is a backup MX server for about 150 domains (including "domain.tld"). $myhostname is actually set to servername.corp.domain.tld, /etc/alias is set to: root: root@domain.tld –  Tuinslak Feb 7 '12 at 17:34

Postfix doesn't permit to send email to a destination SMTP server that have the same myhostname in SMTP banner. Then you must set current myhostname to backup.example.org or something else.

myhostname is a machine name, to avoid this problem you could set the MX server name to 'dexter.example.org' and the backup server name to 'deedee.example.org'. RFC 1178 says 'Use theme names'.

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That's actually the case: "myhostname = botmaster.corp.flatturtle.com" (I should've been more clear with "example.org") –  Tuinslak Feb 8 '12 at 22:40
Then you trying deliver by smtp to local IP. Check the DNS record for 'example.org' (test dns query from backup server) must point to primary server. –  Reinaldo de Carvalho Feb 9 '12 at 11:49
I've edited the original post with dig information (and used the real domains this time to avoid any more confusion). –  Tuinslak Feb 9 '12 at 17:21
when you send mail to 'user' without the domain, postfix add the value configured in option 'myorigin'. The alias_maps option is used to only by MDA 'postfix/local'. If you are senting mail by smtp, alias_maps isn't evoluated. –  Reinaldo de Carvalho Feb 11 '12 at 16:58
do not comment mydestination because the default value is $myhostname value. (use 'postconf -d mydestination' to see the default value). mydestination domains is locally delivered mails. –  Reinaldo de Carvalho Feb 11 '12 at 17:02
up vote 0 down vote accepted

I've found a work around by creating a new domain on the nameserver: "botmaster.corp.flatturtle.com".

The MX records point to another SMTP server.

Thus mailing root (which adds the @botmaster.corp.flatturtle.com domain) is forwarded and correctly delivered.

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