Re: [exim] Cannot send mails to @hotmail.com addresses

Marc Sherman wrote:
> Mike Cardwell wrote:
>> To further expand on this. It appears that this technique does not
>> "bypass" their filters, but gives the message a much higher likelyhood
>> of passing them only. I noticed this when trying to send an email with a
>> .exe attachment to a hotmail account, which was silently dropped. So I
>> did a bunch of further tests to verify that this was the case. So what I
>> did was updated the router to add fake In-Reply-To and References
>> headers to any email destined for a hotmail account to trick hotmail
>> into thinking that the email was a reply. When I did this, all email
>> seems to be getting through. When I remove this, it starts getting
>> blackholed again:
> Do you actually need the X-Hotmail-Fodder headers, or are the
> References/I-R-T headers enough to get past the filters?

I did consider that. The headers on their own don't seem to be a free
pass, but they do help. Otherwise any old spammer could spam all the
hotmail addresses they wanted.

Mike