Welcome to today's podcast. Are you stuck with receiving the Smtplib.Smtpauthenticationerror 535 B’5.7.8 Username And Password Not Accepted error message when sending emails? Then you are not alone! Many users of email services, such as Gmail or Outlook, encounter this common “535” error while emailing. This error may be difficult to find the cause of due to its generic nature, yet there are several steps you can take to try and solve the Smtplib.Smtpauthenticationerror 535 B’5.7.8 Username And Password Not Accepted issue.