我已在 Postfix 中配置了 check_recipient_mx_access 选项，以便拒绝发送拼写错误的域名的电子邮件。我们有一个发送航班确认的系统，很多时候用户会写错联系电子邮件帐户。
该文件指出以下内容
check_recipient_mx_access type:table
Search the specified access(5) database for the MX hosts for the
RCPT TO domain, and execute the corresponding action. If no MX
record is found, look up A or AAAA records, just like the Postfix
SMTP client would. Note: a result of "OK" is not allowed for safety
reasons. Instead, use DUNNO in order to exclude specific hosts from
denylists. This feature is available in Postfix 2.1 and later.
我的配置如下：
main.cf
smtpd_recipient_restrictions = reject_invalid_hostname,
reject_unauth_pipelining,
permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination,
check_client_access hash:/etc/postfix/rbl_override,
check_recipient_mx_access hash:/etc/postfix/bogus_mx,
下列规则被添加到文件bogus_mx中：
54.159.98.68 REJECT
当我尝试通过 telnet 发送电子邮件时，它并没有被拒绝：
root@mailserver:~# telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 mail-front.kiusys.com ESMTP Postfix (Debian/GNU)
ehlo me
250-mail-front.kiusys.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
mail from: [email protected]
250 2.1.0 Ok
rcpt to: [email protected]
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
Subject: Test Telnet
Hello dear,
.
250 2.0.0 Ok: queued as D161160E5D
quit
221 2.0.0 Bye
Connection closed by foreign host.
系统信息：
root@mailserver:/etc/postfix# postconf mail_version
mail_version = 2.11.3
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 8.11 (jessie)
Release: 8.11
Codename: jessie
有任何想法吗？？
问候，