我的 Debian Stretch 安裝遇到了很大的問題。突然，一個客戶電子郵件地址開始發送大量垃圾郵件。
我的伺服器使用標準配置。我用 ISPConfig、Postfix、Dovecot、Amavisd、SpamAssassin 和 ClamAV 安裝了它，我用過“完美的伺服器”教程來自https://www.howtoforge.com/tutorial/perfect-server-debian-9-stretch-apache-bind-dovecot-ispconfig-3-1/。
我託管著許多電子郵件網域和郵箱以及很多網站，其中大多數我被迫在舊版本的 PHP 上運行（5.3.3 是最舊的版本）。所有垃圾郵件僅從一個地址發送，據我所知，它源自於我的本地主機。我立即更改了該帳戶的密碼並停用了 SMTP，但它卻像什麼都沒發生一樣發送垃圾郵件。
我嘗試過遞歸馬爾地特掃描/，它在 /var/www 中檢測到了一些潛在的惡意 PHP 腳本，但刪除後垃圾郵件仍在發送，因此沒有幫助。
說得夠多了，這裡是日誌和設定。
/etc/postfix/main.cf
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no
readme_directory = /usr/share/doc/postfix
compatibility_level = 2
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = nibbler.manena.cz
alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
myorigin = /etc/mailname
mydestination = nibbler.manena.cz, localhost, localhost.localdomain
relayhost =
mynetworks = 127.0.0.0/8 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
html_directory = /usr/share/doc/postfix/html
virtual_alias_domains =
virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman, proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtu$
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
virtual_mailbox_base = /var/vmail
virtual_uid_maps = mysql:/etc/postfix/mysql-virtual_uids.cf
virtual_gid_maps = mysql:/etc/postfix/mysql-virtual_gids.cf
sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes
smtpd_restriction_classes = greylisting
greylisting = check_policy_service inet:127.0.0.1:10023
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_rbl_client zen.spamhaus.org, check_recipient_$
smtpd_tls_security_level = may
transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf
relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender_login_maps.cf
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $sender_bcc_maps $virtual_mailbox_maps $virtual_mailbox_do$
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, check_helo_access regexp:/etc/postfix/helo_access, reject_invalid_hostname, reject_n$
smtpd_sender_restrictions = check_sender_access regexp:/etc/postfix/tag_as_originating.re , permit_mynetworks, permit_sasl_authenticated, check_sender_acces$
smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf
smtpd_client_message_rate_limit = 10
maildrop_destination_concurrency_limit = 1
maildrop_destination_recipient_limit = 1
virtual_transport = dovecot
header_checks = regexp:/etc/postfix/header_checks
mime_header_checks = regexp:/etc/postfix/mime_header_checks
nested_header_checks = regexp:/etc/postfix/nested_header_checks
body_checks = regexp:/etc/postfix/body_checks
owner_request_special = no
smtp_tls_security_level = may
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtpd_tls_protocols = !SSLv2,!SSLv3
smtp_tls_protocols = !SSLv2,!SSLv3
smtpd_tls_exclude_ciphers = RC4, aNULL
smtp_tls_exclude_ciphers = RC4, aNULL
dovecot_destination_recipient_limit = 1
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
content_filter = amavis:[127.0.0.1]:10024
receive_override_options = no_address_mappings
message_size_limit = 0
smtpd_helo_required = yes
strict_rfc821_envelopes = yes
disable_vrfy_command = yes
unknown_address_reject_code = 554
unknown_hostname_reject_code = 554
unknown_client_reject_code = 554
/var/log/mail.info|grep [垃圾郵件 ID 之一]
Mar 14 06:26:38 nibbler postfix/smtpd[4982]: 23D6036D28F: client=localhost[127.0.0.1]
Mar 14 06:26:38 nibbler postfix/cleanup[9381]: 23D6036D28F: message-id=<[email protected]>
Mar 14 06:26:38 nibbler postfix/qmgr[25904]: 23D6036D28F: from=<[email protected]>, size=1958, nrcpt=23 (queue active)
Mar 14 06:26:38 nibbler amavis[9276]: (09276-16) Passed CLEAN {RelayedOutbound}, ORIGINATING LOCAL [178.156.44.57]:3446 [178.156.44.57] <[email protected]> -> <[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>,<[email protected]>, Queue-ID: BB16D36D28E, Message-ID: <[email protected]>, mail_id: I8YkwYIYG_PS, Hits: -0.999, size: 908, queued_as: 23D6036D28F, dkim_new=default:client.com, 370 ms
Mar 14 06:26:38 nibbler postfix/smtp[8926]: BB16D36D28E: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10026, delay=5.6, delays=5.2/0/0/0.37, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10027): 250 2.0.0 Ok: queued as 23D6036D28F)
Mar 14 06:26:38 nibbler postfix/smtp[8926]: BB16D36D28E: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10026, delay=5.6, delays=5.2/0/0/0.37, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10027): 250 2.0.0 Ok: queued as 23D6036D28F)
(...)
你知道現在該怎麼辦嗎？任何建議都非常感激。