My system is undergoing a subscription attack. This made the mail queue grow alarmingly, and because the software is trying to respond to bad addresses, it has caused Microsoft to block us completely and they refuse to remove the block right now.

We are taking steps to improve situation, have adjusted Exim so it doesn't retry mails so often, MS objected to volume and irregularity of mail from us. We are also looking at setting hourly rates, although not sure where to set them

Captchas aren't a good solution as we have many thousands of blind, and deaf-blind users.

There is stuff about the "secret form?" would this work? If I understand it, the IP must match. Then there is stuff about the life of the form? Do both conditions have to be true.? Many of our users do not return a form quickly, they are not that good with their assistive technology! The writing suggests five seconds, that would never work for us.

Are there other things we can do to get us out of this mess?

Thanks in advance!

Dave

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