Sendmail configuration

Kernels & Hardware, configuring network, installing services

Sendmail configuration

Postby iliyan.yordanov » 2017-08-31 10:45

I have managed small debian 8.9 router with installed sendmail 8.14.4 from four months.The sendmail has tuned to use starttls with CA certificates without smtp autorization for mail client from internal network and for mail client from externel network they have ti has instaled certificates in mail client to use mail server and send mail. I thinked that everythink is ok until I found the follow problem . User from externel network can send email without certificate to user from my domain. Example my domain is and mail client or script program with smtp which is fake user from externel network can send mail to all my valid users from exampes to and so on.
What changes I have to do in my sendmail server that for users for externel network sendmail to want compulsory valid certificate
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