I've just found this in my logs (4.14+SA-Exim dlopen patch):
2003-03-21 14:16:55 H=smtp3.wanadoo.fr (mwinf0402.wanadoo.fr)
[193.252.22.27] sender verify fail for <[a validaddress here]@wanadoo.fr>:
response to "RSET" from smtp.wanadoo.fr [193.252.22.83] was: 550
<mail.sabius.net-1048274167-testing@???>: Recipient address
rejected: User unknown
A grep of the logs shows that this has never happened before.
The callout cache cached the address it couldn't test as bad (but didn't
seem to cache the random test reject) and the mail was rejected.
A quick glance at the code shows that this log could show up if the 1st
RSET smtp_write_command() failed... I can't confirm that's what happened
though.
