You really shouldn't be getting that error. Most good email providers should be checking for multiple access attempts from the same ip address, and if the person trying to hack your email doesn't have the same ip as you, the email service provider shouldn't block you. That's a problem of the service provider's, so you might want to try contacting them either through a different email or through phone (if they're a large enough company).
If course, it's possible that you are on a shared network and someone else on your network is trying to access your account. In that case, if you have a home network at home or can otherwise get internet access (say through a public library or internet cafe), log on from there and see if things work out. HOWEVER, I would be careful about logging into your email through a public access point, since it's easy for people to install keyloggers there. Logging on through your home network is definitely optimal.
Finally, take your email off the site and don't ever post your email address out in the open like that again. I'd suggest that you switch emails, because since this email has already been compromised, there's always going to be someone making attempts at hacking it and very little you can do about it. Before you change emails, just let everyone you know who still emails you there to email you at a different email. Pretty simple. Afterwards, don't give out your email to anything but trusted sources.
I'm also pretty sure you can't disable the setting, because most email service providers insist on protecting you. Of course, this does depend on the provider, so you should check with them rather than with me. But this is all a good reason just to change to a new email to avoid the hassle.
Good luck.
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