Primarily you should use IRC to contact MMN-o. If you’re not an IRC:er, you’re best off using the telephone at +46705657637 which is a Swedish cellphone number.
E-mail however is much cheaper, so firstname.lastname@example.org is where you can deliver electronic communication. Though you should make sure you’re using a non-spam-like subject.
If you need to send MMN-o anything physical, use the following postal address and it will be delivered to a postal box in Umeå:
SE-901 08, Umeå