Bug tracker email issue

[Felix Fietkau]

Hi,

it seems that the bug tracker is having issues with sending emails for a
while now. Got some reports that people can't register, and when I make
changes to existing tickets, I get this:

> Completely unexpected exception: Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/answer/14257 c74sm801251wme.1 - gsmtp "
> This should never happend, please inform Flyspray Developers

- Felix