On May 17, 2005, at 12:17 PM, Matt Fretwell wrote:Bart Silverstrim wrote:Maybe even do a reverse check to see if there's a mail server on the sending system...how many systems would break doing a check like that?
The sending server isn't guaranteed to be a MX, so any DNS MX or reverse connection tests would fail.
No guarantees in life :-)
Actually, having separate servers for incoming and outgoing mail is quite common. That's why people have tried to devise standards like RMX, SPF, Caller-Id, Sender-Id, and Domain Keys instead of just making the simple MX check you suggest.
And even *those* solutions have problems.
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