我遇到了一个奇怪的电子邮件问题，但一直找不到任何答案。我有一个使用 postfix 设置的 Ubuntu 服务器，它使用 mailgun 发送电子邮件。我没有使用 mailgun API，只是在 postfix 配置中将其设置为中继主机。
然而，客户收到了一封来自以下地址的电子邮件（真实域名已被取出）：
From: [email protected]
[mailto:[email protected]] On Behalf Of Blackhole
Sent: Friday, July 11, 2014 2:01 PM
让我解释一下这两个域名。他们最初希望发件人地址为“site.org”，尽管服务器只托管“serverwebsite.org”。我的问题是客户不希望“代表 Blackhole”显示为发件人名称，这可以理解，但不知道为什么会这样。
有什么想法会导致它显示这个吗？自从这封电子邮件发出后，我无法重现该问题，我将发件人地址更改为 @serverwebsite 地址 - 我对电子邮件了解不够，不知道这是否可以修复名称。
如果这有帮助，这是我的 postfix main.cf 配置。我有用户名、密码、dns 设置和所有这些。
biff = no
append_dot_mydomain = no
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_CApath= /etc/ssl/certs
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:email:password
smtp_sasl_security_options = noanonymous
smtp_use_tls = yes
myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = localhost
relayhost = [smtp.mailgun.org]:587
mynetworks = 127.0.0.0/8
inet_interfaces = all
mailbox_size_limit = 0
recipient_delimiter = +
inet_protocols = all
home_mailbox = Maildir/
mailbox_command =
smtp_tls_security_level = may
smtpd_tls_security_level = may
smtp_tls_note_starttls_offer = yes
smtp_tls_loglevel = 1
谢谢！
编辑：输出后配置-n：
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
config_directory = /etc/postfix
home_mailbox = Maildir/
inet_interfaces = all
inet_protocols = all
mailbox_command =
mailbox_size_limit = 0
mydestination = localhost
mynetworks = 127.0.0.0/8
myorigin = /etc/mailname
recipient_delimiter = +
relayhost = [smtp.mailgun.org]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:[email protected]:password
smtp_sasl_security_options = noanonymous
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_loglevel = 1
smtp_tls_note_starttls_offer = yes
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_tls_CApath = /etc/ssl/certs
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes