I've received a Mumsnet Team email - on Cakes for summer fetes etc - which won't display on an ipad. (Displays fine on the laptop.) It says in the body 'This message cannot be displayed because of the way it is formatted. Ask the sender to send it again using a different format or email program. multipart/alternative'
(Those last two words look like part of the message but may not be - the punctuation is wrong.)
This is using yahoo via the ipad and is, I think, the first one I've had on the ipad which has gone wrong.