Possible bug in the mass mailer

Hi i have been getting these warnings in my emails , plus many members don't receive any mail , i have no more info just a screenshot of the mail i received. 

Database Connect failed is generally a indication that your database is over loaded.

Common problem on low end inexpensive shared and VPS hosting plans.

It's not a dolphin bug. It's a server problem.

Also, if you have the SMTP Mailer module installed and do not really have a specific need for it, such as having to connect to a third party SMTP server then you should not be using it and it should not be installed.

Great thankyou for the info , very helpful