how do I make someone read

his e-mails? 

Ring him. I only reply to emails of people more senior than me or who can make my life in some way difficult. The important stuff gets ecalated sooner or later, or more likely dropped or done by someone else. 

Have you got $17.3 (seventeen point three) million dollars sitting in an account belong to a childless oil executive who unfortunately died and which you need a friend in god recommend by a mutual acquaintance to claim?

to answer the OP  - I like to motivate known offenders by using the structure 'If I don't hear from you I'll assume it's ok to fire ahead and [sack your team / cut your pay/ land you with this task]. Best, Ronald.'

If he is near you, grab the back of his head and smash his forehead, repetitively, on his keyboard... hard... if you don't split his forehead, you haven't done this hard enough. Bonus points if you break his front teeth.

Naturally this should be done in beat with you screaming "now. read. your. fvcking. emails".

It may be worth it for you to travel to his office to do this if he is further away.

HTH

 

 

'FOR ACTION' in the header. Or use a false flag subject header like: 'Free champagne' or whatever their penchant is....followed up by 'now that' I've got your attention...' in the body of the email.

Failing that, corner them by the water cooler and command them to read it!