This just started happening recently after many years of normal behavior. One user occasionally gets email with attachment(s) displayed in plain-text. (see sample below). Other users in the same office cc’d on the same email receive it with no problem and attachments intact.
SAMPLE STARTS HERE----------
Content-Type: multipart/alternative;
boundary=“=_reb-r18BCA7B9-t48641507”
Content-Language: ja-JP
This is a multi-part MIME message.
–=_reb-r18BCA7B9-t48641507
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset=“utf-8”
RGVubmlzLCBUb255LCBCcmFkLA0KQ0M6IEJvYiwgTmFrYWksIFRhdGVzaGl0YSwgQW5kbywN
Cg0KUGxlYXNlIGFsbG93IG1lIHRvIG1ha2UgY29ycmVjdGlvbiBhYm91dCB0aGUgc2l6ZS4N
…
Any ideas?