Marc Roos wrote:
4. auto reply with something like (maybe with a wait time of x hours):
Your message did not receive the final recipient. You are sending
from a known spam provider
network that is why we blocked your message. Please confirm that:
- you are not a spammer and
- you have permission to use the mail adress you send your message to
- you and your provider agree to uphold GDPR legislation
- you and your provider are liable for damages when breaching any of
the above.
Click link to confirm and you agree with the above
https://www.domainwithoutletsencryptcertificate.com/asdfasdfadsfaf
This is bad practice on multiple levels, please don't do this.
- arbitrary valid email addresses are used as sender address by spammers
to avoid being blocking as unknown sender. Whenever one of your users
gets a spam mail, some innocent unknown user gets the "click on the
link" message by your mail system. It's not spammers are using always
their own usernames. Many spammers also use their spammer address
database as sender addresses as well.
- by sending the "click on the link" message you acknowledge to a
spammer some email he spammed is valid and not unknown. This is a kind
of information that should not be disclosed to spammers.
- two persons who are both behind such a system are not able to
communicate to each other, because they never receive the "click on the
link" message. It is blocked by the other mail system and replied
automatically by another "click on the link" message. Both mail systems
are sending these messages endlessly to each other. It's the "chicken or
egg" problem.
- "click on the link" messages are considered bad practice, because
users must not be educated to click on links in unexpected emails.
Alex
