I'm not sure if the rest of you are seeing the same, but I've seen a lot
of errors like this lately:
554 Service unavailable; Client host [mail-108-mta215.mxroute.com]
blocked by sbl-xbl.spamhaus.org; Error: open resolver;
https://www.spamhaus.org/returnc/pub/74.63.16.232
It seems that Spamhaus is cracking down on a certain type of activity
and it has caught more than a few mail admins with their pants down. As
you can see from the error, these mail servers are configured in such a
way that they assume the connecting IP to be blacklisted when the error
is in fact about that mail server's configuration and not the connecting
IP. This may be a good time to check your own logs, if you are querying
Spamhaus, just to be sure your house is in order.
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