Outgoing emails are missing a Date: field
Concerned version
Version: %2.0
Summary
RFC 2822 mandates that all email messages contain a "Date:" header:
The only required header fields are the origination date field and
the originator address field(s). All other header fields are
syntactically optional. More information is contained in the table
following this definition.
LemonLDAP emails do not contain this field, which is causing some picky providers to drop our messages.