I have used the email bounce handler for 3-4 years with no problems, but now it no longer works with Gmail.
Is this due to a new policy by Gmail that requires login with a browser for security purposes?
The software says "bad command - syntax error"
Do you have a solution for this issue?
Answer: If you get a 534-5.7.14 error saying that you have to "log in via your web browser" or you get a password error just visit this page and turn off the double security option or simply create a password for eMail Bounce Handler as explained here.
Indeed you can create a specific password for eMail Bounce Handler here. By doing so you will be able to continue working with Gmail as usual.
eMail Bounce Handler is a bounce e-mail filtering and handling tool that recognizes bounce e-mails using a customizable set of rules and extracts the recipients addresses allowing you to use them again to try sending your mail or to take them off your list.
eMail Bounce Handler simply connects to your POP or IMAP mailbox in order to retrieve bounces letting any other message untouched.