We can all accept and take on board constructive criticism regarding our Businesses or Business webpages. You take it on the chin and try to fix whatever the problem is. When you receive an email regarding the apparent errors on your website you have to take in to consideration the launch of a new webpage being launched so therefore there will be errors.
Its nice to get the emails highlighting potential bugs as they may be helpful however when the email is coming from a gmail address, with a signature of 'Marketing consultant' you have just got to laugh the email itself tries to use email marketing to offer their services, but the professionalism behind a gmail account is funny because you just can't see that the company is going to be of much help.
Professionalism at its finest if you ask me