We have just performed an urgent upgrade of SendMail to v. 8.12.5 after having been advised by our security experts that the previous version had a vulnerability. Currently we are running LISTSERV 1.8d for Sun Solaris. Does anyone out there have experience with running SendMail 8.12.5 with our version of LISTSERV? Are we likely to encounter any problems with the upgrade? Will we need to customize anything, or will any LISTSERV features "break"? Thanks for any help you can provide. Bronna Bodenstein LISTSERV Administrator National Institutes of Health