nanog mailing list archives
Re: Misguided SPAM Filtering techniques
From: Dave Pooser <dave.nanog () alfordmedia com>
Date: Tue, 23 Oct 2007 19:45:34 -0500
I want to make it clear... I don't mind people filtering either 25 or 587, but, blocking both is highly unacceptable.
I can't see any operational reason to block 587.
Even more unacceptable in my opinion is hijacking connections to either off to your own man-in-the-middle attack server.
We had a client whose RFP vanished into thin air because of that-- he sent it from a hotel that practiced port 25 hijacking and had had their IP blacklisted for spewing much spam and viruses. So our server rejected the message, and when it tried to send the NDN to him *his* server rejected the NDN for the same reason. Fortunately he called the next day with some details he'd omitted.... I recommended he go back with an army of Huns and raze the hotel, but he settled for a nasty letter and using 587/TLS in future. -- Dave Pooser, ACSA Manager of Information Services Alford Media http://www.alfordmedia.com
Current thread:
- Re: Misguided SPAM Filtering techniques, (continued)
- Re: Misguided SPAM Filtering techniques Suresh Ramasubramanian (Oct 21)
- Re: Misguided SPAM Filtering techniques Al Iverson (Oct 22)
- Re: Misguided spam Filtering techniques Rich Kulawiec (Oct 22)
- Re: Misguided SPAM Filtering techniques Gaurab Raj Upadhaya (Oct 21)
- Re: Misguided SPAM Filtering techniques Sean Donelan (Oct 21)
- Re: Misguided SPAM Filtering techniques Dave Pooser (Oct 22)
- Re: Misguided SPAM Filtering techniques Adrian Chadd (Oct 23)
- Re: Misguided SPAM Filtering techniques Owen DeLong (Oct 23)
- Re: Misguided SPAM Filtering techniques Jack Bates (Oct 23)
- Message not available
- Re: Misguided SPAM Filtering techniques Owen DeLong (Oct 23)
- Re: Misguided SPAM Filtering techniques Dave Pooser (Oct 23)
- RE: Misguided SPAM Filtering techniques David Schwartz (Oct 23)
- Re: Misguided SPAM Filtering techniques Dave Pooser (Oct 23)
- Re: Misguided SPAM Filtering techniques Adrian Chadd (Oct 23)
- Re: Misguided SPAM Filtering techniques William Herrin (Oct 23)
- Re: Misguided SPAM Filtering techniques Suresh Ramasubramanian (Oct 23)