I got this in the log:
[01] 2/5 11:17:20 235 2.0.0 Authentication successful
[01] 2/5 11:17:20 > MAIL FROM:<
[email protected]>
[01] 2/5 11:17:21 250 2.1.0 <
[email protected]>... Sender ok
[01] 2/5 11:17:21 > RCPT TO:<
[email protected]> [1/1]
[01] 2/5 11:17:22 250 2.1.5...