Hua Y via Postfix-users:
> Hello
>
> I sent a subscribe request to debian-list, and got this info in
> mail.log:
>
> Nov 21 06:05:18 cloud postfix/smtpd[2395479]: connect from
> bendel.debian.org[82.195.75.100]
> Nov 21 06:05:19 cloud policyd-spf[2395481]: prepend Received-SPF: None
> (no SPF record) identity=helo; client-ip=82.195.75.100;
> helo=bendel.debian.org; envelope-from=<>; receiver=<UNKNOWN>
> Nov 21 06:05:19 cloud postfix/smtpd[2395479]: 8725D17A6D0:
> client=bendel.debian.org[82.195.75.100]
> Nov 21 06:05:19 cloud postfix/smtpd[2395479]: disconnect from
> bendel.debian.org[82.195.75.100] ehlo=2 starttls=1 mail=1 rcpt=1 rset=1
> quit=1 commands=7
Apparently, after RCPT TO, the client sent RSET and disconnected,
instead of sending DATA (with message content).
This could have been an address verification probe. bendel is a
Postfix machine, and "sendmail -f '<>' -bv xxx" will ask Postfix
to find out if xxx is a valid recipient address, by connection to
its mail server and sending MAIL FROM:<>, RCPT TO:<xxx>, and RSET.
Wietse
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