伺服器發送垃圾郵件 - 如何找出原因？

我在專用伺服器上有一個 CentOS 6。我是唯一一個可以通過 shell 訪問它的人。我在那里托管了 2 個 Wordpress 和幾個簡單的 PHP 站點。我的託管公司剛剛給我發了一封電子郵件，說他們在我發送垃圾郵件時阻止了我的 25 埠。

# cat /var/log/maillog
Jul 11 16:43:28 stock postfix/smtp[31689]: 2D55610D3EE: to=<bgpvv@athoise.com>, relay=mail.athoise.com[217.16.10.3]:25, delay=0.53, delays=0.04/0/0.42/0.07, dsn=5.1.1, status=bounced (host mail.athoise.com[217.16.10.3] said: 550 5.1.1 <bgpvv@athoise.com>: Recipient address rejected: User unknown in virtual mailbox table (in reply to RCPT TO command))
Jul 11 16:43:28 stock postfix/qmgr[15611]: 2D55610D3EE: removed
Jul 11 16:45:09 stock postfix/qmgr[15611]: C836D10D3AA: from=<>, size=15048, nrcpt=1 (queue active)
Jul 11 16:45:40 stock postfix/smtp[31836]: connect to syad.net[208.91.197.27]:25: Connection timed out
Jul 11 16:45:40 stock postfix/smtp[31836]: C836D10D3AA: to=<ngsukxaqiq@syad.net>, relay=none, delay=424757, delays=424727/0.02/30/0, dsn=4.4.1, status=deferred (connect to syad.net[208.91.197.27]:25: Connection timed out)
Jul 11 16:45:48 stock postfix/anvil[31682]: statistics: max connection rate 1/60s for (smtp:92.84.169.239) at Jul 11 16:42:27
Jul 11 16:45:48 stock postfix/anvil[31682]: statistics: max connection count 1 for (smtp:92.84.169.239) at Jul 11 16:42:27
Jul 11 16:45:48 stock postfix/anvil[31682]: statistics: max cache size 1 at Jul 11 16:42:27
Jul 11 16:50:09 stock postfix/qmgr[15611]: AC61110D254: from=<medications-discounted6@odessa.ua>, size=54804, nrcpt=1 (queue active)
Jul 11 16:50:57 stock postfix/smtp[32061]: AC61110D254: host gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1b] said: 421-4.7.0 [2001:41d0:2:a9e5::1      15] Our system has detected an unusual rate 421-4.7.0 of unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. ej4si5267528wid.3 - gsmtp (in reply to end of DATA command)
Jul 11 16:51:42 stock postfix/smtp[32061]: AC61110D254: to=<MY REAL EMAIL ADDRESS WAS HERE>, orig_to=<MY REAL EMAIL ADDRESS WAS HERE>, relay=gmail-smtp-in.l.google.com[173.194.67.26]:25, delay=1438, delays=1345/0.02/62/32, dsn=4.7.0, status=deferred (host gmail-smtp-in.l.google.com[173.194.67.26] said: 421-4.7.0 [188.165.222.229      15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. fr7si4416957wib.79 - gsmtp (in reply to end of DATA command))
Jul 11 16:55:09 stock postfix/qmgr[15611]: 51C0910D03F: from=<pharmacy_affordable15@spdop.ru>, size=55141, nrcpt=1 (queue active)
Jul 11 16:55:38 stock postfix/smtp[32284]: 51C0910D03F: host gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1a] said: 421-4.7.0 [2001:41d0:2:a9e5::1      15] Our system has detected an unusual rate 421-4.7.0 of unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. pi9si4491273wjb.81 - gsmtp (in reply to end of DATA command)
Jul 11 16:56:09 stock postfix/smtp[32284]: 51C0910D03F: to=<MY REAL EMAIL ADDRESS WAS HERE>, orig_to=<MY REAL EMAIL ADDRESS WAS HERE>, relay=gmail-smtp-in.l.google.com[173.194.67.26]:25, delay=80376, delays=80316/0.02/50/11, dsn=4.7.0, status=deferred (host gmail-smtp-in.l.google.com[173.194.67.26] said: 421-4.7.0 [188.165.222.229      15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. hj12si4501206wib.8 - gsmtp (in reply to end of DATA command))
Jul 11 17:00:09 stock postfix/qmgr[15611]: 64DEB10D2B9: from=<>, size=4743, nrcpt=1 (queue active)
Jul 11 17:00:11 stock postfix/smtp[32552]: 64DEB10D2B9: to=<wojtekd28@primesentry.com>, relay=none, delay=84582, delays=84580/0.02/1.9/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=primesentry.com type=MX: Host not found, try again)
Jul 11 17:05:49 stock dovecot: pop3-login: Disconnected (tried to use disabled plaintext auth): rip=92.45.136.23, lip=188.165.222.229
Jul 11 17:06:17 stock dovecot: pop3-login: Disconnected (tried to use disabled plaintext auth): rip=92.45.136.23, lip=188.165.222.229
Jul 11 17:10:09 stock postfix/qmgr[15611]: 3E11910D212: from=<drugs_popular1@starnet.md>, size=58247, nrcpt=1 (queue active)

以上都是垃圾郵件。我怎樣才能知道它是從哪裡發送的？它是 WordPress 中的一個漏洞嗎，它是否以某種方式安裝在我的伺服器上？是別的嗎？

非常感謝任何幫助。謝謝。

從您的日誌看來，郵件最初是發送到您伺服器上的電子郵件地址，該地址設置為轉發到 Gmail 地址。

因為這些郵件是垃圾郵件，所以當您將它們發回時，它們會被視為垃圾郵件。

我的建議是根本不要以這種方式轉發郵件，而只是在此處接收並在此處處理。我們大多數人都有多個電子郵件地址要處理，這並不是非常不方便。

引用自：https://serverfault.com/questions/611972