Mail 8.1, attachments in outlook are showed with ATT00001.htm files
At my work I use Mac and Mail 8.1 app. Everyday I send attachments to Outlook users and they see with attachment files ATT00001.htm. If I send 10 attachments outlook users see 20 attached files - 10 of them trash files like ATTxxxxx.htm. Before upgrading to Mail 8.1 I was using add-ons to Mail app like Universal Mailer http://universalmailer.github.io/UniversalMailer/download.html
which is not supported in Mac Mail 8.1;
and before Yosemite I was using Attachment Tamer from http://lokiware.info/Attachment-Tamer
which is not supported in Yosemite.
Does anybody have any idea how to solve this problem (any add-on to Mail app which will be working with Mail 8.1)?
MacBook Pro (Retina, 15-inch, Mid 2014), OS X Yosemite (10.10.1)