evernote preview to m

I tried to post something to evernote by email. But I got a failure
indication later after that. Then I loged in to the evernote website. I
went to the setting page. I found that the email address which I can
send to for posting has been changed from xxx@preview.evernote.com to
xxx@m.evernote.com

PS: this mail is sent by mutt using alias as group.