Server OS: NT40/SP6a, Exchange 5.5/SP4
Client OS: Windows 98, Outlook 2000
Firewall: Netscreen 10
Starting end of April, few certain users(bbbb.com) reported they didn't receive emails sent by some certain people(aaaa.com). The senders didn't get any undelivable message. After a request to the senders for resend, the emails get thru. Occasionally the senders need to try (send) for three times. Emails sent from other sources seem to be OK so far for the repipients.
We've be bothered by this mystery for more than one week. Would you please help?
Sorry I only have 70 points to offer.
P.S. aaaa.com has box size limit but bbbb.com doesn't.