您好，我正在嘗試在 Centos 7 伺服器上設定 sendmail，以將郵件從本機程式中繼到我們的主郵件伺服器。我已使用以下內容配置了 sendmail.mc，mail.[domain].com 是我們的 SMTP 伺服器：
定義（'SMART_HOST'，'mail.[domain].com'）dnl
和
FEATURE(
nullclient',郵件.[網域].com') dnl
這是嘗試發送此郵件的 sendmail 日誌：
Aug 24 11:52:18 centos7 sendmail[21975]: w7O8qIUJ021975: Authentication-Warning: centos7.[domain]: openproject set sender to info@[domain].com using -f
Aug 24 11:52:18 centos7 sendmail[21975]: w7O8qIUJ021975: from=info@[domain].com, size=2587, class=-60, nrcpts=1, msgid=<5b7fc7423c037_218b2acdfb6fcf7c2088c@centos7.[domain].mail>, relay=openproject@localhost
Aug 24 11:52:18 centos7 sendmail[21976]: w7O8qIMw021976: from=<info@[domain].com>, size=2854, class=-60, nrcpts=1, msgid=<5b7fc7423c037_218b2acdfb6fcf7c2088c@centos7.[domain].mail>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
Aug 24 11:52:18 centos7 sendmail[21975]: w7O8qIUJ021975: to=dennis@[domain].com, ctladdr=info@[domain].com (988/982), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=140587, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (w7O8qIMw021976 Message accepted for delivery)
Aug 24 11:52:18 centos7 sendmail[21978]: STARTTLS=client, relay=mail.[domain].com., version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-AES256-SHA384, bits=256/256
Aug 24 11:52:18 centos7 sendmail[21978]: w7O8qIMw021976: to=<dennis@[domain].com>, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=230854, relay=mail.[domain].com. [192.168.111.10], dsn=5.1.1, stat=User unknown
Aug 24 11:52:18 centos7 sendmail[21978]: w7O8qIMw021976: w7O8qIMw021978: DSN: User unknown
Aug 24 11:52:18 centos7 sendmail[21978]: w7O8qIMw021978: to=<info@[domain].com>, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30000, relay=mail.[domain].com. [192.168.111.10], dsn=5.1.1, stat=User unknown
Aug 24 11:52:18 centos7 sendmail[21978]: w7O8qIMw021978: w7O8qIMx021978: return to sender: User unknown
Aug 24 11:52:18 centos7 sendmail[21978]: w7O8qIMx021978: to=postmaster, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30000, relay=mail.[domain].com. [192.168.111.10], dsn=5.1.1, stat=User unknown
Aug 24 11:52:18 centos7 sendmail[21978]: w7O8qIMw021978: Losing ./qfw7O8qIMw021978: savemail panic
Aug 24 11:52:18 centos7 sendmail[21978]: w7O8qIMw021978: SYSERR(root): savemail: cannot save rejected email anywhere
現在，根據 sendmail 日誌的內容，我的電子郵件 dennis@[domain].com 似乎不存在，這很奇怪，因為它確實存在。但如果我查看郵件伺服器中的日誌，它會顯示略有不同的內容：
Fri 2018-08-24 11:52:18.667: Session 471387; child 0001
Fri 2018-08-24 11:52:18.667: Accepting SMTP connection from 192.168.111.15:42300 to 192.168.111.10:25
Fri 2018-08-24 11:52:18.670: --> 220 xxxx ESMTP MDaemon 18.0.2; Fri, 24 Aug 2018 11:52:18 +0300
Fri 2018-08-24 11:52:18.672: <-- EHLO centos7.[domain]
Fri 2018-08-24 11:52:18.673: --> 250-xxxxx Hello centos7.[domain] [192.168.111.15], pleased to meet you
Fri 2018-08-24 11:52:18.673: --> 250-ETRN
Fri 2018-08-24 11:52:18.673: --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Fri 2018-08-24 11:52:18.673: --> 250-8BITMIME
Fri 2018-08-24 11:52:18.674: --> 250-ENHANCEDSTATUSCODES
Fri 2018-08-24 11:52:18.674: --> 250-STARTTLS
Fri 2018-08-24 11:52:18.674: --> 250 SIZE
Fri 2018-08-24 11:52:18.683: <-- STARTTLS
Fri 2018-08-24 11:52:18.683: --> 220 2.7.0 Ready to start TLS
Fri 2018-08-24 11:52:18.705: SSL negotiation successful (TLS 1.2, 256 bit key exchange, 256 bit AES encryption)
Fri 2018-08-24 11:52:18.716: <-- EHLO centos7.[domain]
Fri 2018-08-24 11:52:18.716: --> 250-xxxxx Hello centos7.[domain] [192.168.111.15], pleased to meet you
Fri 2018-08-24 11:52:18.716: --> 250-ETRN
Fri 2018-08-24 11:52:18.716: --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Fri 2018-08-24 11:52:18.716: --> 250-8BITMIME
Fri 2018-08-24 11:52:18.716: --> 250-ENHANCEDSTATUSCODES
Fri 2018-08-24 11:52:18.716: --> 250 SIZE
Fri 2018-08-24 11:52:18.724: <-- MAIL From:<info@mail.[domain].com> SIZE=3046
Fri 2018-08-24 11:52:18.726: --> 250 2.1.0 Sender OK
Fri 2018-08-24 11:52:18.754: <-- RCPT To:<dennis@mail.[domain].com>
Fri 2018-08-24 11:52:18.755: Sender attempted to deliver message to unknown address
因此，由於某種原因，寄件者和收件者電子郵件地址中的網域部分已損壞。郵件伺服器認為有人試圖發送到 dennis@mail.[domain].com，而實際上我想發送到 dennis@[domain].com。
我不知道它為什麼這樣做。
答案1
嗯，幾乎令人尷尬，但我繼續瀏覽 sendmail.mc 文件並發現我之前激活的以下位，我推薦了 LOCAL_DOMAIN 行，事情開始工作。
dnl # Also accept email sent to "localhost.localdomain" as local email.
dnl #
LOCAL_DOMAIN(`[domain].com')dnl