==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
張SIR
客戶無法寄信近來，去查了LOG顯示以下

Oct 29 16:59:24 mailsvr postfix/smtps/smtpd[6088]: connect from mail.elementis.com[107.1.52.227]
Oct 29 16:59:25 mailsvr postfix/smtps/smtpd[6088]: Anonymous TLS connection established from mail.elementis.com[107.1.52.227]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Oct 29 16:59:25 mailsvr postfix/smtps/smtpd[6088]: NOQUEUE: reject: RCPT from mail.elementis.com[107.1.52.227]: 554 5.7.1 <mail.elementis.com[107.1.52.227]>: Client host rejected: Access denied; from=<sandra.wu@elementis.com> to=<XXXXX@XXXXXXXXX> proto=ESMTP helo=<mail.elementis.com>
Oct 29 16:59:26 mailsvr postfix/smtps/smtpd[6088]: disconnect from mail.elementis.com[107.1.52.227]

請問這個該如何解決??