Unable to unblock user 'sending' - suspicious activity

Unable to unblock user 'sending' - suspicious activity

Had used blocked (IMAP, POP, sending) due to suspicious activity (think it was logging on over VPN, change of country in short time).  can unblock IMAP and POP fine, but unable to unblock 'sending' - message saying 'contact support@zohomail.com'.  don't know if email was sent okay as sending is blocked....
help please - what to do?