Background - we had a server crash, restored it (is a new server in fact). Internal server only. Emails started backing up in the queues. Noticed it was emails with a larger size. Moved mailboxes to a different server. Public folders however can't (easily!!) be moved. I know I could anyway move these folders with a bit of work but would anyway like to find out what the underlying problem is. Ran the diagnostics tool with the "mail backing up" diagnostic selection. Showed BDAT failing to both internally-connected servers, no other obvious error (comes up with stuff like 4096 ping has to be fragmented but that doesn't seem like an error to me). Switched firewall off, no help. Took out all non-exchange sinks on both sending and receiving servers, nothing changed. The smtp log doesn't help (as far as I can see!), I just see a bunch of BDAT 250 (good) followed by QUIT 240 (bad) like this: MAIL - +FROM: 250 0 49 36 0 SMTP - - - - receipt-server SMTPSVC1 RECEIPT-SERVER 0 RCPT - +TO: 250 0 38 48 0 SMTP - - - - bad-server SMTPSVC1 RECEIPT-SERVER 0 xexch50 - +2892+2 354 0 22 14 0 SMTP - - - - bad-server SMTPSVC1 RECEIPT-SERVER 0 BDAT - +<B144F0BA5A2D9D40A135EF39E8E83924257ABD@receipt-server> 250 0 100 2894 172 SMTP - - - - bad-server SMTPSVC1 RECEIPT-SERVER 0 QUIT - bad-server 240 468 70 4 0 SMTP - - - - What should my next step be to get to the bottom of this problem?! Thanks for any help
