After putting lmtp_admins: cyruslmtp into /etc/imapd.conf, now I can receive mail. Setting smtp_sasl_auth_enable = yes would mean all clients sending mail to Postfix will be authenticated via sasl, including Exchange or other peoples' servers too?
No, that would be smtpd_sasl_auth_enabled, and only depending on the setting of smtpd_recipient_restrictions.
You should google for "postfix smtp auth" or look at the "documentation, howto and faqs" section at postfix.org.
Bye
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