Postfix邮件服务器Milter初始握手报错排查求助

我给公司搭了个Postfix邮件服务器，跟着Linux Babe的系列教程一步步弄的，大部分功能都正常运行，但最近在maillog里看到俩警告，折腾了半天没找到根源，想问问社区里有没有人遇到过类似问题？

服务器环境信息 #

• 操作系统：Alma Linux 8
• Postfix版本：2:3.5.8-4.el8
• Postgrey版本：1.37-9.el8
• Spamass-milter版本：0.4.0-13.el8
• Spamassassin版本：3.4.6-1.el8

报错日志 #

postfix/10025/smtpd[169161]: warning: milter inet:127.0.0.1:783: unreasonable packet length: 1397768525 > 1073741823
postfix/10025/smtpd[169161]: warning: milter inet:127.0.0.1:783: read error in initial handshake

相关配置文件片段 #

Postfix main.cf 配置段

policyd-spf_time_limit = 3600

smtpd_recipient_restrictions =
permit_mynetworks
permit_sasl_authenticated
reject_unauth_destination
check_policy_service unix:private/policyd-spf
check_policy_service unix:postgrey/socket
check_client_access hash:/etc/postfix/rbl_override
reject_rhsbl_helo dbl.spamhaus.org
reject_rhsbl_reverse_client dbl.spamhaus.org
reject_rhsbl_sender dbl.spamhaus.org
permit_dnswl_client list.dnswl.org=127.0.[0..255].[1..3]
reject_rbl_client zen.spamhaus.org

##Milter configuration
milter_default_action = accept
milter_protocol = 6
smtpd_milters = inet:127.0.0.1:8891,inet:127.0.0.1:783,unix:/run/spamass-milter/spamass-milter.sock
non_smtpd_milters = $smtpd_milters
content_filter = smtp-amavis:[127.0.0.1]:10024
smtpd_proxy_options = speed_adjust

Postfix master.cf 配置段

#==========================================================================
#service type  private unpriv  chroot  wakeup  maxproc command + args
#(yes)   (yes)   (no)    (never) (100)
#==========================================================================

smtp      inet  n       -       n       -       -       smtpd
#smtp      inet  n       -       n       -       1       postscreen
#smtpd     pass  -       -       n       -       -       smtpd
#dnsblog   unix  -       -       n       -       0       dnsblog
#tlsproxy  unix  -       -       n       -       0       tlsproxy

submission inet n       -       n       -       -       smtpd
-o syslog_name=postfix/submission
-o smtpd_tls_security_level=encrypt
-o smtpd_sasl_auth_enable=yes
-o smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject
-o smtpd_relay_restrictions=permit_sasl_authenticated,reject
-o smtpd_sasl_type=dovecot
-o smtpd_sasl_path=private/auth
-o content_filter=smtp-amavis:[127.0.0.1]:10026

smtps     inet  n       -       n       -       -       smtpd
-o syslog_name=postfix/smtps
-o smtpd_tls_wrappermode=yes
-o smtpd_sasl_auth_enable=yes
-o smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject
-o smtpd_relay_restrictions=permit_sasl_authenticated,reject
-o smtpd_sasl_type=dovecot
-o smtpd_sasl_path=private/auth
-o content_filter=smtp-amavis:[127.0.0.1]:10026

pickup    unix  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
#qmgr     unix  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
trace     unix  -       -       n       -       0       bounce
verify    unix  -       -       n       -       1       verify
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       n       -       -       smtp
-o syslog_name=postfix/$service_name
showq     unix  n       -       n       -       -       showq
error     unix  -       -       n       -       -       error
retry     unix  -       -       n       -       -       error
discard   unix  -       -       n       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache
postlog   unix-dgram n  -       n       -       1       postlogd

policyd-spf  unix  -       n       n       -       0       spawn user=policyd-spf argv=/usr/libexec/postfix/policyd-spf

smtp-amavis  unix  -       -       n       -       2       smtp
-o syslog_name=postfix/amavis
-o smtp_data_done_timeout=1200
-o smtp_send_xforward_command=yes
-o disable_dns_lookups=yes
-o max_use=20
-o smtp_tls_security_level=none

127.0.0.1:10025   inet   n    -     n     -     -    smtpd
-o syslog_name=postfix/10025
-o content_filter=
-o mynetworks_style=host
-o mynetworks=127.0.0.0/8
-o local_recipient_maps=
-o relay_recipient_maps=
-o strict_rfc821_envelopes=yes
-o smtp_tls_security_level=none
-o smtpd_tls_security_level=none
-o smtpd_restriction_classes=
-o smtpd_delay_reject=no
-o smtpd_client_restrictions=permit_mynetworks,reject
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o smtpd_end_of_data_restrictions=
-o smtpd_error_sleep_time=0
-o smtpd_soft_error_limit=1001
-o smtpd_hard_error_limit=1000
-o smtpd_client_connection_count_limit=0
-o smtpd_client_connection_rate_limit=0
-o receive_override_options=no_header_body_checks,no_unknown_recipient_checks,no_address_mappings

sysconfig/spamass-milter 配置段

EXTRA_FLAGS="-e mydomainname.com -u sa-milt -m -r 8 -R SPAM_ARE_NOT_ALLOWED_HERE -i 127.0.0.1 -g sa-milt -- --max-size=5120000"

sysconfig/spamassassin 配置段

SPAMDOPTIONS="-c -m5 -H --razor-home-dir='/var/lib/razor/' --razor-log-file='sys-syslog' --nouser-config --virtual-config-dir=/var/vmail/%d/%l/spamassassin --username=vmail"

有没有大佬碰到过这种Milter初始握手报错的情况？麻烦给指点一下排查方向，万分感谢！

备注：内容来源于stack exchange，提问作者phyre