我在后缀设置中找不到原因，但在不同的 uid 下发送了重复的电子邮件。查看电子邮件标头，它们具有唯一的 id，并且每个都有不同的Postfix, from userid. 例如，有人说：
Received: by localhost.localdomain (Postfix, from userid 1000)
id AFFE880C9E43; Thu, 7 Mar 2024 03:04:02 -0800 (PST)
而另一个说：
Received: by localhost.localdomain (Postfix, from userid 0)
id A076980CB3FD; Thu, 7 Mar 2024 03:04:02 -0800 (PST)
邮件日志显示的postfix/pickup行也显示了两个 uid，然后电子邮件在该postfix/smtp行上发送了两次：
Mar 7 20:57:01 localhost postfix/pickup[1523368]: A0DA580CC916: uid=1000 from=<[email protected]>
Mar 7 20:57:01 localhost postfix/cleanup[1534353]: A0DA580CC916: message-id=<Aej4eFk4CtMsohU6wbxrlXigdloI53zuZDvecHneZ9Y@localhost>
Mar 7 20:57:01 localhost postfix/qmgr[1487578]: A0DA580CC916: from=<[email protected]>, size=1059, nrcpt=1 (queue active)
Mar 7 20:57:01 localhost postfix/pickup[1523368]: C74B180CB50F: uid=0 from=<[email protected]>
Mar 7 20:57:01 localhost postfix/cleanup[1534353]: C74B180CB50F: message-id=<jUeGOoaBFebz2tFQZEhCnoShgiL8EL0RhvaynFZKM@localhost>
Mar 7 20:57:01 localhost postfix/qmgr[1487578]: C74B180CB50F: from=<[email protected]>, size=1046, nrcpt=1 (queue active)
Mar 7 20:57:04 localhost postfix/smtp[1534359]: A0DA580CC916: to=<[email protected]>, relay=d96439a.ess.barracudanetworks.com[209.222.82.255]:25, delay=2.6, delays=0.19/0.01/0.41/1.9, dsn=2.0.0, status=sent (250 OK ([email protected]:250 Ok: queued as D76BE1180056))
Mar 7 20:57:04 localhost postfix/qmgr[1487578]: A0DA580CC916: removed
Mar 7 20:57:05 localhost postfix/smtp[1534363]: C74B180CB50F: to=<[email protected]>, relay=d96439b.ess.barracudanetworks.com[209.222.82.253]:25, delay=4.1, delays=0.09/0.01/0.47/3.5, dsn=2.0.0, status=sent (250 OK ([email protected]:250 Ok: queued as 933FB1180056))
Mar 7 20:57:05 localhost postfix/qmgr[1487578]: C74B180CB50F: removed
在main.cf文件中，有：
mydestination = $myhostname, localhost.$mydomain
不确定还有哪些其他相关设置。
为什么电子邮件会在两个 uid 下发送？一个用于“root”用户，一个用于另一个用户，但为什么两者都被使用呢？我查看了发送电子邮件的 php 文件，它们只发送一次。为了进行测试，我使用了普通的 html 电子邮件格式。例子：
$to = '[email protected]';
$subject = "A message for you";
$message = "Hello there!";
$headers[] = 'MIME-Version: 1.0';
$headers[] = 'Content-type: text/html; charset=iso-8859-1';
$headers[] = 'From: Test <[email protected]>';
if(mail($to, $subject, $message, implode("\r\n", $headers))) {
echo "E-Mail Sent";
} else {
echo "There was a problem";
}
操作系统是AlmaLinux 9.3，基本上是RHEL的一个分支。
编辑：
响应@dennis-nolte，“postconf -n”返回：
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
compatibility_level = 2
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
html_directory = no
inet_interfaces = localhost
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
meta_directory = /etc/postfix
milter_default_action = accept
mydestination = $myhostname, localhost.$mydomain
mynetworks = 127.0.0.0/8
newaliases_path = /usr/bin/newaliases.postfix
non_smtpd_milters = $smtpd_milters
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix/README_FILES
sample_directory = /usr/share/doc/postfix/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
shlib_directory = /usr/lib64/postfix
smtpd_milters = inet:localhost:8891
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_rbl_client zen.spamhaus.org, reject_rhsbl_reverse_client dbl.spamhaus.org, reject_rhsbl_helo dbl.spamhaus.org, reject_rhsbl_sender dbl.spamhaus.org
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
unknown_local_recipient_reject_code = 550
...并且 /etc/aliases 文件包含一堆列为“root”的伪帐户，最后是这些：
newsadm: news
newsadmin: news
usenet: news
ftpadm: ftp
ftpadmin: ftp
ftp-adm: ftp
ftp-admin: ftp
www: webmaster
webmaster: root
noc: root
security: root
hostmaster: root
info: postmaster
marketing: postmaster
sales: postmaster
support: postmaster
我承认我不知道如何处理这些信息。
作为对@anx的回应，我如何找出谁在生成@localhost消息ID？在“postconf -n”响应中，有一些对“localhost”的引用 -inet_interfaces = localhost并且mydestination = $myhostname, localhost.$mydomain- 其中之一可能是罪魁祸首吗？
感谢您提供任何帮助来追踪此问题。