[Mimedefang] Only MX record is fake
Kevin A. McGrail
KMcGrail at PCCC.com
Thu Nov 17 17:39:41 EST 2011
> Those people checking for valid MX records for a sender's domain from
> within MIMEdefang ... is anybody checking if a sender's one and only
> MX record is a fake MX tempfailing service? Has anyone ever seen this
> type of setup for legitimate e-mail?
> For example:
> # nslookup -type=MX babe.org
> Server: 127.0.0.1
> Address: 127.0.0.1#53
> Non-authoritative answer:
> babe.org mail exchanger = 0 mx.fakemx.net.
I actually plan to add that check to checkvalidMX because it's an
invalid MX and if it's their only MX (or coupled with other invalid
MXs), than it's indicative of a spammer IMO.
I spoke to 8086 about that back in May whether that was a problem
because it's outside of their ToS. This was his response:
"If a domain lists mx.fakemx.net as it's only MX - mail will never be
accepted for the domain so I see no real problem with it being
considered as no valid MX. There is an outside case of someone only
listing fakemx for a period of time before having a legitimate MX record
but that isn't what the service is provided for."
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