The OpenSAML project maintains a single mailing list where users/developers may post questions. This mailing list is for those using the OpenSAML library, and not a list for general SAML questions. If you have general SAML questions, please post them to the saml-dev mailing list.
Before posting a "bug"-type question, you can search the issues list at https://bugs.internet2.edu/ to see if it's already reported or fixed. Bugs might be reported against several different sub-projects (XMLTooling, OpenWS, or OpenSAML itself).
Do NOT use the bug reporting system to ask general questions; we will close such entries immediately.