It's been around for a fairly long time.
On 11/24/2011 12:29 PM, Steve Perrault wrote:
> Thanks Ed. This is exactly what I'm after. How did I miss this? Is it
> new for v5?
> - SteveP
> On 11/24/2011 12:19 PM, Ed wrote:
>> g_from_must_exist - Require local from addresses to exist or reject mail
>> Can be useful in blocking dumb spam robots
>> Syntax: g_from_must_exist bool
>> On 11/24/2011 11:00 AM, Steve Perrault wrote:
>>> SurgeMail Version 5.3i-31, Built Aug 24 2011 17:20:26, Platform Linux
>>> (Surgeweb Enabled)
>>> Am I missing a setting? Is it possible to do this with surgemail?
>>> Our surgemail mirrors host hundreds of domains. Our users are getting
>>> phish FROM a bogus account for the local domain. For instance,
>>>HIDDEN@mnsi.net will get email from email@example.com, or
>>>HIDDEN@firstname.lastname@example.org. I add the bogus addresses when they occur, but
>>> sometimes the sender is random text, likeHIDDEN@mnsi.net.
>>> This could be mitigated if the sender address or envelope sender is
>>> verified against the local user database when the sender's domain (in
>>> From, or envelope sender) is a locally hosted domain.
>>> Back in the days of sendmail, I had a ruleset in place to do this --
>>> compare FROM against passwd file). This was more to minimize customer
>>> viruses which would fake the sender address by changing a character in
>>> the user's email address (ie, change steve toHIDDEN@mnsi.net).
>>> - SteveP
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