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How can i configure my exim4 server to keep it protected?
Today we noticed some emails sended through in, but this server dont is used to send emails, just to read.
Is possible someone used telnet to send emails, i need use DigitalOcean Firewall to block something?
This is the log of an email sent:
2018-04-17 14:56:34 1f8UqH-00063i-4z <= internal-email@subdomain.mydomain.com H=(CUSTOMER-ISP) [CUSTOMER-IP] P=esmtp S=4189 id=002101d3d65c$01730410$11fc68a8$@subdomain.mydomain.com
56bd8300516443db8f6e925c6721b4
affiliatetrading
admin
saeeddarabi
djanym
skeddtemp
gebelo
martinjameslynn
Brenda Morales
d02e0b7b59c2429cb46fcbb782