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 accounting@mnsi.net, or
>HIDDEN@erservice@mnsi.net. 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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