After some further digging on the missing attachment, looks like the
fault is in the line MIMENCODE='base64-encode'. I don't have such an
executable in the system.
If I comment this line or replace it with
MIMENCODE='/usr/bin/mimencode', I receive an attached file which looks
like this:
Content-Type: image/tiff; name="fax000000110.tif"
Content-Transfer-Encoding:
Content-Disposition: attachment; filename="fax000000110.tif"
Content-Description: FAX document
Does this look like a valid encoded file? And - shouldn't there be something specified in the
Content-Transfer-Encoding: line?