我在 Raspberry Pi 上运行 Postfix。我的户外摄像头检测到任何动作时都会发送电子邮件。我正在将此电子邮件发送到脚本。总是有 2-3 秒的延迟，但 Pi 有 99% 处于空闲状态。所以我认为这是一个配置问题。
日志：
Oct 3 18:07:55 raspberrypi postfix/smtpd[11348]: connect from OutdoorCam.fritz.box[192.168.173.39]
Oct 3 18:07:55 raspberrypi postfix/smtpd[11348]: NOQUEUE: filter: RCPT from OutdoorCam.fritz.box[192.168.173.39]: <[email protected]>: Sender address triggers FILTER triggerCamAlert:dummy; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<localhost>
Oct 3 18:07:55 raspberrypi postfix/smtpd[11348]: 38F713FED0: client=OutdoorCam.fritz.box[192.168.173.39]
Oct 3 18:07:55 raspberrypi postfix/cleanup[11351]: 38F713FED0: message-id=<>
Oct 3 18:07:55 raspberrypi postfix/qmgr[24540]: 38F713FED0: from=<[email protected]>, size=469, nrcpt=1 (queue active)
Oct 3 18:07:55 raspberrypi postfix/smtpd[11348]: disconnect from OutdoorCam.fritz.box[192.168.173.39]
Oct 3 18:07:57 raspberrypi postfix/pipe[11352]: 38F713FED0: to=<fhem@raspberrypi>, orig_to=<[email protected]>, relay=triggerCamAlert, delay=2.5, delays=0.07/0/0/2.4, dsn=2.0.0, status=sent (delivered via triggerCamAlert service)
Oct 3 18:07:57 raspberrypi postfix/qmgr[24540]: 38F713FED0: removed
主配置文件
# ==========================================================================
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (yes) (never) (100)
# ==========================================================================
smtp inet n - - - - smtpd
#smtp inet n - - - 1 postscreen
#smtpd pass - - - - - smtpd
#dnsblog unix - - - - 0 dnsblog
#tlsproxy unix - - - - 0 tlsproxy
#submission inet n - - - - smtpd
# -o syslog_name=postfix/submission
# -o smtpd_tls_security_level=encrypt
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
#smtps inet n - - - - smtpd
# -o syslog_name=postfix/smtps
# -o smtpd_tls_wrappermode=yes
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
#628 inet n - - - - qmqpd
pickup fifo n - - 60 1 pickup
cleanup unix n - - - 0 cleanup
qmgr fifo n - n 300 1 qmgr
#qmgr fifo n - n 300 1 oqmgr
tlsmgr unix - - - 1000? 1 tlsmgr
rewrite unix - - - - - trivial-rewrite
bounce unix - - - - 0 bounce
defer unix - - - - 0 bounce
trace unix - - - - 0 bounce
verify unix - - - - 1 verify
flush unix n - - 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - - - - smtp
relay unix - - - - - smtp
# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq unix n - - - - showq
error unix - - - - - error
retry unix - - - - - error
discard unix - - - - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - - - - lmtp
anvil unix - - - - 1 anvil
scache unix - - - - 1 scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent. See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
triggerCamAlert unix - n n - - pipe flags=X user=filter argv=/opt/fhem/triggerCamAlert.sh
知道什么可能导致这种延迟吗？
欢迎任何提示！
托贝利克斯
答案1
对于有洞察力的读者来说，信息已经在您的日志文件中了。
你估计“延迟 2-3 秒”您的示例中的时间实际上正好是 2.5 秒：
Oct 3 18:07:57 raspberrypi postfix/pipe[11352]: ... delay=2.5, delays=0.07/0/0/2.4 ...
^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^
这delays=a/b/c/d实际上是对 SMTP 事务的哪一部分需要多少时间的细分，如本文所述问答。
最长的消息传输时间是2.4秒。
这只是因为发送者需要很长时间才能提交完整的消息，而这并不是您的 Postfix 配置本身的错误。