On Thu, Jun 26, 2025 at 10:33:14AM +0200, Support 3Hound via mailop wrote:
> Dear list,
> is it fair/correct to check the existence of a mailbox for about
> 30/50 mail addresses/day?

Please indicate the IP addresses (ranges) that you will be doing
this from. I will make sure there is an iptables DROP rule for them
on all email infrastructure I control.

If you use cloud infrastructure for which this approach does not
make sense, please indicate the domain name(s) you will be HELOing
as so that your HELOs can get a "Verifiers not welcome" response
and all your requests will be denied.

-- 
Atro Tossavainen, Chairman of the Board
Infinite Mho Oy, Helsinki, Finland
tel. +358-44-5000 600, http://www.infinitemho.fi/
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