Re: Pass the environment variable to the smtpd daemon

[postfix-user]

https://www.postfix.org/postconf.5.html#import_environment

Be sure to augment rather than replace the default set of variables:

    # postconf -e "import_environment = $(postconf -dh import_environment) 
SSLKEYLOGFILE=/some/where"

you can also update just the smtpd(8) service in master.cf:

    # postconf -e "smtpd_impenv = $(postconf -dh import_environment) 
SSLKEYLOGFILE=/some/where"
    # postconf -Pe 'smtp/inet/import_environment=$smtpd_impenv'
    # postfix reload

Use double and single quotes as indicated.
See the postconf(1) manpage, and if you prefer edit the config files by hand.

Thank yoy !