All my emails from automated services send from the address user@myhostname.mac.com, how can I fix this?My main.cf is:# 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/mailnamesmtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)biff = no# appending .domain is the MUA's job.append_dot_mydomain = no# Uncomment the next line to generate delayed mail warnings#delay_warning_time = 4hreadme_directory = no# TLS parameterssmtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pemsmtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.keysmtpd_use_tls=yessmtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scachesmtp_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.smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated     defer_unauth_destination#myhostname = gateblogs.comalias_maps = hash:/etc/aliasesalias_database = hash:/etc/aliasesmyorigin = /etc/mailname#myorigin = myhostnamemydestination = $myhostname, gateblogs.com, localhost,     localhost.localdomain, localhostrelayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128mailbox_size_limit = 0recipient_delimiter = +inet_interfaces = allinet_protocols = ipv4virtual_alias_maps = hash:/etc/postfix/virtual
How to fix postfix sending messages from myhostname.mac.com?
postfix