请问修改“问候语”的问题

oval

请教老大，www.dnsreport.com报告说greeting设置不规范。如何能够修改220 后面的提示内容。虽然是一个警告，不是错误，但是不改总觉得不是很好。希望老大能够加上修改“问候语”的功能。<br>
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WARN Mail server host name in greeting WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). This probably won't cause any harm, but is a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server.<br>
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mail2.xxx.com claims to be invalid hostname 'ESMTP': <br>220 ESMTP on WinWebMail [3.7.0.3] ready. <a target=_blank href=http://www.winwebmail.com>http://www.winwebmail.com</a> <br>
mail.xxx.com claims to be invalid hostname 'ESMTP': <br>220 ESMTP on WinWebMail [3.6.3.1] ready. <a target=_blank href=http://www.winwebmail.com>http://www.winwebmail.com</a>