MailboxIt looks like somebody uses @exploreourpla.net as sender address to send bulk mails (spam). The admin mailbox is full of returned to sender mails. Is it that easy to hijack a mail account? Actually I was thinking switching to Google mail for domains is safe.

To everybody affected by unsolicited mail, I have to say sorry for any unconvenience. It was never my intention to assist spam sender. I hope somebody can enlighten me on how to stop this impertinent behaviour. Many thanks in advance.