April 26, 2022 3:13 PM, "Bill Cole" <postfixlists-070...@billmail.scconsult.com> wrote:
> On 2022-04-26 at 07:09:41 UTC-0400 (Tue, 26 Apr 2022 11:09:41 +0000) > <pat...@patpro.net> > is rumored to have said: >> Unless you run postfix on a 10 years old Raspberry, it can handle the > load. > > Not always true. There is obviously a point where the server won't be capable of handling the load, always. But what are the odds with "just" a brute-force on passwords/accounts? Our outbound/internal mail gateway handles the traffic for +2K every-day users +28K occasional users. Millions emails per month. It handles also emails sent by applications. One of these app had a problem last October and tried to send +2M emails per day, for many days: the app authenticated on the mail server (sasl/dovecot) tried to send the mail, got bounced because recipient was non-valid, got disconnected, re-connected and tried again with next recipient, etc. Nobody noticed, no user complained, no performance impact at all. We only find out because of the postfix log volume increase. It's a virtual machine with 4 vcpu and 10GB RAM (most ram is used by antispam), it can handle way more: it runs postfix multi, does antispam/av filtering and dkim singing for outbound, handles mailing lists peaks of +60K messages, etc. patpro
