Jun 11 18:32:23 server sm-mta: STARTTLS=server, relay=public, version=TLSv1. My sendmail.mc define(`confAUTH_OPTIONS',`A p')dnlĭefine(`confAUTH_MECHANISMS', `EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnlĭAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnlĭefine(`CERT_DIR', `MAIL_SETTINGS_DIR`'certs')dnlĭefine(`confCACERT', `CERT_DIR/cacert.pem')dnlĭefine(`confSERVER_CERT', `CERT_DIR/sendmail-cert.pem')dnlĭefine(`confSERVER_KEY', `CERT_DIR/sendmail-key.pem')dnlĭefine(`confCLIENT_CERT', `CERT_DIR/sendmail-cert.pem')dnlĭefine(`confCLIENT_KEY', `CERT_DIR/sendmail-key.pem')dnl Besides the classic usage, Postfix can also be configured to send emails by local applications only. The job of Postfix is to route and deliver emails. I am trying to find out why its not working. Installing and Configuring Postfix as a Send-only SMTP Server on Ubuntu 20.04 Postfix is a popular free and open-source software that acts as a mail transfer agent ( MTA ). The TLS handshake is working, the auth command is supported. I have used a copy and paste to ensure that the string is not mistyped. The auth string is generated by perl -MMIME::Base64 -e 'print code here

I can say (where foobar is the name of the server ) ELHO fooĢ50-foobar Hello public, pleased to meet youĪUTH PLAIN AGRwNDJAc2VydmVyLmRwMjY0Mi5mb3JjZTkuY28udWsAdmFkZXI0Mg=^M I have been trying to harden a sendmail server, trying to ensure that user has to login using TLS connection to an smtp mail server.

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