IncrediMail is a user-friendly email program, which provides the user with immense options to make the emailing fun. On the other hand, a user might get some errors which restrict them to proceed further.
535 error messages can pop up because of wrong input of the username or password.
Following are the solutions to resolve this error-
1. Check username and password twice.
2. Try to login via webmail.
3. Try to reset the password
Steps for resolving Error 535 Incredimail authenticationError 535 Incredimail authentication failed are mentioned above, if the error persists submit the ticket to Technical Support Team or for further assistance check our website.