gmailに送受信できないのでレンタルサーバーの設定をしてほしい。
Hi. This is the qmail-send program at m35.coreserver.jp.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
Remote host said: 550-5.7.26 This mail has been blocked because the sender is unauthenticated.
550-5.7.26 Gmail requires all senders to authenticate with either S...