Robert,
> The settings are listed in the example conf.d/15-lda.conf file. The > important settings are: > > sendmail_path is used to send mails. Note that the default is > /usr/sbin/sendmail, which doesn't necessarily work the same as > /usr/lib/sendmail. > > Alternatively you can use submission_host to send mails via the > specified SMTP server. This is the missing piece of information I wasn't finding. Thank you very much...