The mailing list for DMRG++ and related project is at https://elist.ornl.gov/mailman/listinfo/dmrgpp. You may write to dmrgpp at ornl dot gov and messages will appear publicly at the above URL, in the archives. The main DMRG++ developer G. A. can be contacted at gz1 at ornl dot gov. Use plain text email (no HTML email, please). Attachments should be avoided if at all possible. In any case, no proprietary attachments (Word, PowerPoint, etc) please. My webpage is https://g1257.github.io/