If you google "fail2ban postfix", you will get a large number of links to ideas about using fail2ban to prevent this.

On 2022-04-25 11:29, Mauricio Tavares wrote:
On Mon, Apr 25, 2022 at 12:28 AM ミユナ (alice)<al...@coakmail.com>  wrote:
do you know how to stop passwords from being brute-forced for a
mailserver? do you have any practical guide?

       What about multifactor authentication?

thank you.

--
Ron Wheeler
Artifact Software
438-345-3369
rwhee...@artifact-software.com

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