"Too many login attempts."

Hello, change the password and now I can not enter to modify my blog in the Ghost platform. He says “Too many login attempts.” Can anybody help me? I did not send the email to add authors, in the last attempt appeared this: rror sending email! Error sending email: Failed to send email. Reason: Mail from command failed - 550 5.7.1 Service unavailable, Client host [206.189.178.148] blocked using Spamhaus. To request removal from this list see https://www.spamhaus.org/query/ip/[206.189.178.148] (AS3130). [AM5EUR02FT051.eop-EUR02.prod.protection.outlook.com]. Please check your email settings and resend the invitation.

Can anybody help me??