Hello All, Currently, we run Listserv 14.5 on Solaris 9 UNIX platform. In the go.user file, we implemented: SORT_RECIPIENTS=1 Export SORT_RECIPIENTS MAXBSMTP=50 Export MAXBSMTP Apparently, when Listserv sorted the email distribution for a particular internal listserv list, we have been experienced significant email delay due to multiple domain accounts were sorted in the same q* file that sendmail processed. For example: Subscribers mail's accounts in our domain "mail.nih.gov" are sorted among with other "mail.ocvts.org", "mail.ru", "mail.sctboces.org","mail.sdsu.edu",...and so on. When sendmail process could not contact the mailserver of the first listed rRFC822 address, it just deferred that mail piece of distribution. We greatly appreciate any information that you could provide to help us resolve this issue. Sincerely, Ho Cao Do