mail admins? Proposal of solution

Denys Fedoryshchenko nuclearcat at
Fri May 1 12:52:10 UTC 2020

On 2020-04-30 02:43, Mark Andrews wrote:
> And it is still on going.  Just got 4 of these.
> Mark
Technical proposal how to solve that.

At 1st of month send monthly reminder manually, to each subscriber, but 
encode recipient address in Reply-To: a bit special way.
First, you need catch-all alias on special domain.
Then, you calculate reply-to, for example if destination recipient:
hash("secret-keyword" + user at
So, it becomes:
Reply-To: aabbccdd at

Then just check all bounces received to *, and 
unsubscribe relevant users.

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