undelivered mail returned to sender this is the zapp - smtp program at host mail . zappmobile . ro . i ' m sorry to have to inform you that the message returned below could not be delivered to one or more destinations . for further assistance , please send mail to if you do so , please include this problem report . you can delete your own text from the message returned below . the zapp - smtp program : host / var / imap / socket / lmtp [ / var / imap / socket / lmtp ] said : 552 5 . 2 . 2 over quota ( in reply to rcpt to command )