relayhost = [your-smtp-server-addr]:587  ; Replace [your-smtp-server-addr] with your SMTP server address
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_use_tls = yes
smtpd_relay_restrictions = permit_mynetworks
mydestination = localhost
myhostname = postfix
mynetworks = 127.0.0.0/8, 172.0.0.0/8, 192.168.0.0/16, 10.0.0.0/8, [::1]/128
smtp_tls_security_level = may
smtpd_tls_security_level = none
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd  # <-- (Optional) Remove when using inline credentials
# --> (Optional) When using inline credentials, uncomment the following line and replace the placeholders with your SMTP server address and credentials
# smtp_sasl_password_maps = inline:{ [your-smtp-server-addr]:587=username:password }  # <-- Replace [your-smtp-server-addr] with your SMTP server address, and username:password with your SMTP server credentials
# <--