Since 2 days, outgoing mails stay in the SMTP Queue.

Following are the 2 warning messages we get with event-ID
4000:

1 - Message delivery to the remote
domain 'corporatedirtbag.com' failed for the following
reason: The remote server did not respond to a connection
attempt.

2 - Message delivery to the remote domain 'carbogen.com'
failed for the following reason: The connection was
dropped by the remote host.

We have a lot of SMTP traffic on our Firewall, but the
mails seem not to be accepted by the recipient's domains.

Any idea.
Thanks.

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