I just received an email with the following;
You account has been locked due to too many failed password or PIN attempts. Please follow the URL below to unlock your account.
It looks likely that another pool (not coinmine.pl) has been compromised. I always use different passwords but the same username, so it looks like an attempt from a compromised pool.
I am mining on their pool for Particle.
I urge coinmine.pl users to change their passwords/pins if they use the same login information on any other pools.
