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- iRedMail 版本号：0.9.7
- 使用哪个数据库存储用户帐号（OpenLDAP，MySQL，PostgreSQL）：OpenLDAP
- 使用的 Linux/BSD 发行版名称及版本号：centos 7
- 与您的问题相关的日志信息：
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邮件服务器与外网有个中继服务器进行端口转发，能发不能收，收件延迟中继服务器报错：
收件人认证不可用 (cuda_nsu 4.7.1 <barracuda.starmail.com>: Helo command rejected: Host not found )
邮件服务器log贴下面，谢谢
Sep 25 18:16:56 mail postfix/postscreen[2251]: HANGUP after 1.2 from [111.179.95.150]:51978 in tests after SMTP handshake
Sep 25 18:16:56 mail postfix/postscreen[2251]: DISCONNECT [111.179.95.150]:51978
Sep 25 18:16:58 mail postfix/postscreen[2251]: CONNECT from [18.18.97.34]:40487 to [192.168.1.54]:25
Sep 25 18:16:58 mail postfix/postscreen[2251]: PASS OLD [18.18.97.34]:40487
Sep 25 18:16:58 mail postfix/smtpd[3484]: connect from unknown[18.18.97.34]
Sep 25 18:16:58 mail postfix/smtpd[3484]: disconnect from unknown[18.18.97.34]
Sep 25 18:17:08 mail postfix/postscreen[2251]: CONNECT from [18.18.97.34]:40488 to [192.168.1.54]:25
Sep 25 18:17:08 mail postfix/postscreen[2251]: PASS OLD [18.18.97.34]:40488
Sep 25 18:17:08 mail postfix/smtpd[3479]: connect from unknown[18.18.97.34]
Sep 25 18:17:08 mail postfix/smtpd[3479]: disconnect from unknown[18.18.97.34]
Sep 25 18:17:08 mail postfix/smtpd[2834]: NOQUEUE: reject: RCPT from unknown[18.18.97.34]: 450 4.7.1 <barracuda.starmail.com>: Helo command rejected: Host not found; from=<postmaster@barracudanetworks.com> to=<luohuiqing@starmail.com> proto=ESMTP helo=<barracuda.starmail.com>
Sep 25 18:17:10 mail postfix/postscreen[2251]: CONNECT from [18.18.97.34]:40490 to [192.168.1.54]:25
Sep 25 18:17:10 mail postfix/postscreen[2251]: PASS OLD [18.18.97.34]:40490
Sep 25 18:17:10 mail postfix/smtpd[3481]: connect from unknown[18.18.97.34]
Sep 25 18:17:10 mail postfix/smtpd[3481]: disconnect from unknown[18.18.97.34]
Sep 25 18:17:20 mail postfix/smtpd[2834]: NOQUEUE: reject: RCPT from unknown[18.18.97.34]: 450 4.7.1 <barracuda.starmail.com>: Helo command rejected: Host not found; from=<postmaster@barracudanetworks.com> to=<luohuiqing@starmail.com> proto=ESMTP helo=<barracuda.starmail.com>
Sep 25 18:17:24 mail postfix/postscreen[2251]: CONNECT from [59.59.131.233]:57151 to [192.168.1.54]:25
Sep 25 18:17:24 mail postfix/dnsblog[3400]: addr 59.59.131.233 listed by domain zen.spamhaus.org as 127.0.0.11
Sep 25 18:17:24 mail postfix/dnsblog[3400]: addr 59.59.131.233 listed by domain zen.spamhaus.org as 127.0.0.4
Sep 25 18:17:24 mail postfix/postscreen[2251]: PREGREET 14 after 0.05 from [59.59.131.233]:57151: EHLO ylmf-pc\r\n