[latortuga]

Plenty of folks who reported getting this email from LP, including myself, reported that they used a strong unique passphrase for LP only.

[tuwtuwtuwtuw]

LastPass wrote that there was a bug causing these emails to be sent.

That may be correct, because several persons have reported reproducing that issue before the LastPass fix - they have written that they logged on with incorrect password while using an IP from another country and still got the email that their master password was used.

[latortuga]

Very interesting and would set my mind a bit more at ease.