Catch-all mailboxes are being identified by many vendors these days
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Just a FYI:
I see more and more checks in my mail logs by service providers like
helo@gamalogic.com
orcheck@kickboxio.net
if my email server has a "catch-all" mailbox.They send emails either to a random address like
4a47f57a869a0ea0@domain.com
or at the same time to such random address and the address you used for e.g. registration on a website.I have long switched from catch-all mailboxes to aliases with wildcards so the emails mentioned above are rejected; they would get delivered to a catch-all mailbox (and such successful delivery will be monitored).
If you do use catch-all mailboxes and have problems with registration at websites and / or reputation of your mail server, you might want to consider a switch.