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A comment on Ask HN: How do you protect your Mailserver from DDoS Attacks?.
1) check that our MTA is up to date 2) check that we got fail2ban rules for POP&SMTP failed logins 3) use a haproxy and ban by subnet/country
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1) check that our MTA is up to date 2) check that we got fail2ban rules for POP&SMTP failed logins 3) use a haproxy and ban by subnet/country