During the afternoon it emerged that the “PetrWrap/Petya” malware is currently spreading quickly in many places, including Ukraine.

Here are the facts that we can contribute to “PetrWrap/Petya”:
– Since midday it is no longer possible for the blackmailers to access the email account or send emails.
– Sending emails to the account is no longer possible either.

https://posteo.de/en/blog/info-on-the-petrwrappetya-ransomware-email-account-in-question-already-blocked-since-midday

It’s never a good idea to pay the ransom, even if they had the intention to give you your decryption code, they are not even going to be receiving  your email.

Patch and Backup.