Starting to see 550 undeliverable errors on my gwia more and more.
Happened for one user trying to send an appt to a local resource as
well as his own calendar (we've started people using Data Synchronizer,
so we were testing calendar stuff).

When he sent the appointment to a resource and his own calendar, the
resource received it just fine, but it did not get back to his account.

This was listed in the gwia log file right around the time we were
trying this. Our email domain is ccgov.net, and our GWIA is on our
local network.

11:13:21 F47A MSG 418873 Command: EHLO mail.ccgov.net
11:13:21 F47A MSG 418873 Response: 250 ok
11:13:21 F47A MSG 418873 Command: MAIL FROM:<ALK08@ccgov.net>
11:13:21 F47A MSG 418873 Response: 250 OK
11:13:21 F47A MSG 418873 Detected error on SMTP command
11:13:21 F47A MSG 418873 Command: RCPT TO:<'ALK08@ccgov.net'>
11:13:21 F47A MSG 418873 Response: 550 Host unknown
11:13:21 F47A MSG 418873 Command: DATA
11:13:21 F47A MSG 418873 Response: 221 Closing transmission channel
11:13:21 F47A Building undeliverable message



Suggestions?

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Stevo