On 25 Sep 2019, at 15:43, necktwi via Exim-users <exim-users@exim.org> wrote:
> How to run recovery? I tried rm -rf /var/spool/exim/db/* and started the exim

That’s one perfectly valid way, although there are others specific to the 
Berkeley DB tools you have installed (or can install).

However:

> These messages are being flooded every second! How did i...@lee.org pipeline 
> mail to yahoo from my server? I didn't send any mail to any gmail user and 
> how come my exim server is pipelining a request to gmail server every second?

You need to look at your logs in more detail, for the lines containing ‘ <= ‘. 
That’ll show from where the messages are arriving.

It’s almost certainly going to be one of the following in decreasing order of 
likelihood but increasing seriousness:

1. Compromised account using SMTP Auth
2. Compromised account using webmail
3. Configuration allowing open relay
4. Configuration allowing relay from a box which has been compromised
5. Compromised account running arbitrary code on your box

Graeme
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