This test will list MX records for a domain in priority order. The MX lookup is done directly against the domain’s authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check and measure response time performance. You may also check each MX record (IP Address) against 147 DNS based blacklists . (Commonly called RBLs, DNSBLs)
Posts Tagged ‘sendmail’
MX Lookup
August 10th, 2010The SPF Setup Wizard
August 10th, 2010Most domains send outbound mail through a relatively small number of servers. Domains should describe that set of servers in an SPF record in their DNS. Internet email receivers can then reject forged messages which don’t come from an envelope sender domain’s approved servers. This wizard helps domain owners identify all the servers which could be expected to send mail from their domain.
Mail Server增加SPF记录
August 2nd, 2010什么是SPF
就是Sender Policy Framework。SPF可以防止别人伪造你来发邮件,是一个反伪造性邮件的解决方案。当你定义了你的domain name的SPF记录之后,接收邮件方会根据你的SPF记录来确定连接过来的IP地址是否被包含在SPF记录里面,如果在,则认为是一封正确的邮件,否则则认为是一封伪造的邮件。关于更详细的信息请参考RFC4408(http://www.ietf.org/rfc/rfc4408.txt)
设置 SPF 的 DNS 记录
August 2nd, 2010Introduction
SPF的完整意思为 “Sender Policy Framework”。翻译过来就是发送方策略框架,是一项跟 DNS 相关的技术,它的内容写在 DNS 的 txt 类型记录里面,关于更详细的信息请参考 RFC4408: http://www.ietf.org/rfc/rfc4408.txt
SPF 的原理是使用电子邮件的头部信息中的 ‘Return Path’ 或 ‘Mail From’ 这两个邮件头里的域名来结合真正提供这个邮件的服务商 DNS 里面的记录去验证发送邮件服务器是否是冒充行为。
SPF 的官方网站是: http://www.openspf.org/ » Read more: 设置 SPF 的 DNS 记录
Telnet 到 SMTP Server 发邮件
July 14th, 2010在现代网络环境中,Mail Relay是个讨论得比较热烈的话题。如何允许外部用户或移动用户在公司的邮件服务器上进行Mail Relay是人们关注的焦点。随着标准化SASL认证的出现,并结合开放源软件Sendmail新版本中对SMTP AUTH的支持,该问题已经逐渐变得明朗而易于解决。本文是一个利用Telenet登录到Mail Server,并通过SMTP Server来发邮件的应用实例。在Unix/Linux的系统中,如果直接用Telnet测试某一个系统服务是否启动,只要输入“Telnet 主机IP地址”就可以简单地验证Service的启动状态,而且还能进一步与Server做一些指令的输入及交互操作,接下来还可用Telnet登录连接到一个Mail Server发一封信进行测试(前提是连接的Mail Server可以进行Relay,否则会被Mail Server当作广告垃圾邮件处理)。