Package: exim4-config Version: 4.96-16 Users need to set IGNORE_SMTP_LINE_LENGTH_LIMIT=true else they cannot forward messages except ones with short lines.
Alas, # update-exim4.conf --verbose using non-split configuration scheme from /etc/exim4/exim4.conf.template undocumented line IGNORE_SMTP_LINE_LENGTH_LIMIT=true found in /etc/exim4/update-exim4.conf.conf, generating exim macro