Is this a harmless error?

Yes.

I had the same question. Sieve is OK, but sieve NOTIFY is not supported in dbmail. You should change the SIEVE_NOTIFY to "no" in dbmail.conf:

# Turn on/off the Sieve Notify extension.
SIEVE_NOTIFY = no

Interesting... Here (on 2.2.7) I just turned off the NOTIFY extension and suddenly all the filters stop working. So I'll live with the message and leave it enabled.
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