Am 26.06.25 um 10:33 schrieb Support 3Hound via mailop:
Dear list,
is it fair/correct to check the existence of a mailbox for about 30/50 mail
addresses/day?
This is generally frowned upon, although you may technically get away with it
in most cases.
When there's a chain of data collection and "lead generation", there's almost always something fishy about it. You claim
that your customer collects e-mail addresses written on contracts. That implies that the end user who signed the
contract should know who he's been dealing with, and it should not be surprising to them to get an e-mail from your
customer to verify the e-mail address. This is just fair to the end user, and it also allows you to handle cases where
end users write addresses which exist but which they do not own (which happens often enough, whether due to human error
or malice).
Since you're in the EU, you should probably ask a lawyer whether your proposed workflow complies with the EU GDPR. I'm
not a lawyer, and contents and interpretation of laws sometimes surprise me and seem illogical, but at the end of the
day the laws and courts of law decide whether something is allowed or may lead to punishment.
That said, when I catch someone probing addresses (especially using deceptive practices such as lots of anonymous
domains) I'll block them, regardless of the formal lawfulness of their activity. If they don't disclose their identity
or that of their customer, why should I disclose the identites of my users?
Cheers,
Hans-Martin
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