One of my emails is sending spam

One of the emails that are active on my server is sending spam.
I have already changed the email password but it continues to send spam.

There are a lot of emails that he sends in a short period.

Note: Other emails from this server do not do this.

I'm new to email servers. can anybody help me?

gfeix
Hello, it is recommended to back up the data, delete the relevant users and check whether it will still be sent after a while?

I disabled the user and now I'm monitoring the server's behavior.

This is the log I'm getting now.

They are still trying to send spam with my server.

another log record:

the user is inactive

gfeix
Hello, your domain name is plantiagro.com?
Is rspamd used or running?