First thing first, MailPress is back (since Friday) in the WordPress plugin repository.
Remember that PHP Mail is not supported anymore. So you have to have a smtp server whether you access it via smtp or sendmail.
To accept international emails, your smtp server needs to support SMTPUTF8
Future enhancements :
Removing Google Map for Open Street Map (done !)
Review to be done for revisions and form addon.
Happy New Year !