Dovecot尝试验证外部收件人用户的问题求助

大家好，我目前使用的是Dovecot 2.3.4.1版本，搭配SQL认证，整体运行完全正常。

不过我在日志里发现一个奇怪的现象：当我用PHP脚本给用户列表发邮件时，Dovecot似乎在尝试验证收件人？我可能对日志的解读有误，但如果邮件是从info@example.com发往test@yahoo.com这种外部邮箱，Dovecot为什么要去验证test@yahoo.com这个用户呢？

相关日志条目 #

mail postfix/smtpd[9532]: connect from server1.example.com[192.168.2.111]

mail postfwd2/policy[8667]: [RULES] rule=0, id=RULE001, client=server1.example.com[192.168.2.111], sender=<info@example.com>, recipient=<test@yahoo.com>, helo=<server1.example.com>, proto=ESMTP, state=RCPT, delay=0.00s, hits=RULE001, action=dunno

mail dovecot: auth-worker(13507): sql(test@yahoo.com): unknown user

mail postfix/smtpd[9532]: DE059240031: client=server1.example.com[192.168.2.111]

mail postfix/cleanup[9534]: DE059240031: message-id=<11ac7c97d4a0afc4d0bc4832674457fe@server1.example.com>

有没有人能帮忙分析一下原因？谢谢！

我的Postfix配置文件 #

main.cf

alias_database = hash:/etc/aliases

alias_maps = hash:/etc/aliases

append_dot_mydomain = no

biff = no

compatibility_level = 2

inet_interfaces = all

inet_protocols = all

mailbox_size_limit = 0

message_size_limit = 25600000

milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}

mydestination = $myhostname, mail.example.com, mail3.example.com, localhost.example.com, localhost

myhostname = mail.example.com

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.2.0/24

myorigin = /etc/mailname

non_smtpd_milters = inet:127.0.0.1:11332

readme_directory = no

recipient_delimiter = +

relayhost =

smtp_tls_security_level = may

smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)

smtpd_milters = inet:127.0.0.1:11332

smtpd_recipient_restrictions = check_policy_service unix:private/quota-status

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination

smtpd_sasl_auth_enable = yes

smtpd_sasl_path = private/auth

smtpd_sasl_type = dovecot

smtpd_sender_restrictions = check_policy_service inet:127.0.0.1:10040

smtpd_tls_auth_only = yes

smtpd_tls_cert_file = /etc/letsencrypt/live/mail.example.com/fullchain.pem

smtpd_tls_key_file = /etc/letsencrypt/live/mail.example.com/privkey.pem

smtpd_tls_security_level = may

smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache

smtpd_use_tls = yes

soft_bounce = no

virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf

virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf

virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf

virtual_transport = lmtp:unix:private/dovecot-lmtp

postconf: warning: /etc/postfix/main.cf: unused parameter: 127.0.0.1:10040_time_limit=3600

master.cf

smtp       inet  n       -       y       -       -       smtpd

submission inet  n       -       y       -       -       smtpd -o syslog_name=postfix/submission -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -o smtpd_tls_auth_only=yes -o smtpd_reject_unlisted_recipient=no -o smtpd_recipient_restrictions= -o milter_macro_daemon_name=ORIGINATING

pickup     unix  n       -       y       60      1       pickup

cleanup    unix  n       -       y       -       0       cleanup

qmgr       unix  n       -       n       300     1       qmgr

tlsmgr     unix  -       -       y       1000?   1       tlsmgr

rewrite    unix  -       -       y       -       -       trivial-rewrite

bounce     unix  -       -       y       -       0       bounce

defer      unix  -       -       y       -       0       bounce

trace      unix  -       -       y       -       0       bounce

verify     unix  -       -       y       -       1       verify

flush      unix  n       -       y       1000?   0       flush

proxymap   unix  -       -       n       -       -       proxymap

proxywrite unix  -       -       n       -       1       proxymap

smtp       unix  -       -       y       -       -       smtp

relay      unix  -       -       y       -       -       smtp -o syslog_name=postfix/$service_name

showq      unix  n       -       y       -       -       showq

error      unix  -       -       y       -       -       error

retry      unix  -       -       y       -       -       error

discard    unix  -       -       y       -       -       discard

local      unix  -       n       n       -       -       local

virtual    unix  -       n       n       -       -       virtual

lmtp       unix  -       -       y       -       -       lmtp

anvil      unix  -       -       y       -       1       anvil

scache     unix  -       -       y       -       1       scache

postlog    unix-dgram n  -       n       -       1       postlogd

maildrop   unix  -       n       n       -       -       pipe flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}

uucp       unix  -       n       n       -       -       pipe flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)

ifmail     unix  -       n       n       -       -       pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)

bsmtp      unix  -       n       n       -       -       pipe flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient

scalemail-backend unix - n       n       -       2       pipe flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}

mailman    unix  -       n       n       -       -       pipe flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}

备注：内容来源于stack exchange，提问作者Nic