エラーメッセージ一例 ・Insufficient permission ・exceeded storage allocation ・mailbox for user is full ・mailbox is full ・Quota exceeded (mailbox for user is full) ・Email quota exceeded ・The email account that you tried to reach is over quota.
エラーメッセージ一例 ・User unknown ・user not found ・Recipient address rejected: invalid address ・The email account that you tried to reach does not exist ・User unknown in local recipient table ・We weren’t able to find the recipient domain ・The email account that you tried to reach is disabled.