require_resolvable_fromhost, hook mail returned DENYSOFT, Could not resolve XXXXX.com...... (#4.4.3)

[[EMAIL PROTECTED]]

When I test qpsmtpd server, two email addresses have been set up, one is
for A domain, it works fine; another is for B domain. When testing B, 
qpsmtpd log has message like this: Plugin require_resolvable_fromhost, hook
mail returned DENYSOFT, Could not resolve B (#4.4.3).

Any ideas?

Thanks


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