Hi, I _know_ I am overlooking something, and I need a clue-bat.
I use postscreen on the SMTP (25) port and smptd on the submission port; the latter requires authentication via dovecot. This usually works except every now and then when sending mail, almost always from hotel networks (where I spend a lot of time), I get one of these: Oct 31 23:31:56 mx4 postfix/smtpd[2575]: connect from unknown[66.171.166.114] Oct 31 23:31:56 mx4 postfix/smtpd[2575]: Anonymous TLS connection established from unknown[66.171.166.114]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) Oct 31 23:31:56 mx4 postfix/smtpd[2575]: NOQUEUE: reject: RCPT from unknown[66.171.166.114]: 554 5.7.1 Service unavailable; Client host [66.171.166.114] blocked using sbl.spamhaus.org; https://www.spamhaus.org/sbl/query/SBLCSS; from=<a...@anvilwalrusden.com> to=<REDACTED> proto=ESMTP helo=<anvilwalrusden.com> Oct 31 23:31:56 mx4 postfix/smtpd[2575]: lost connection after RCPT from unknown[66.171.166.114] Oct 31 23:31:56 mx4 postfix/smtpd[2575]: disconnect from unknown[66.171.166.114] ehlo=2 starttls=1 auth=1 mail=1 rcpt=0/1 commands=5/6 It seems to me that I have somehow managed to put the DNSBL filters on my submission port, which seems (1) obviously wrong and (2) mystifying. So I'm wondering whether anyone has a hint on what I should start looking at so that I can fix this. It's clear to me that I didn't know what I was doing when I set this up or this wouldn't have happened; but I'm really, really sure that I am unable to read all the parts of the documentation now (like this week) to understand what I did wrong without a clue about where to start digging. Hence the plea. This isn't totally urgent, because my solution is more or less always to hook up to my phone, which pretty reliably doesn't have this problem. But it annoys me that I've messed it up. Thanks for your help, A -- Andrew Sullivan a...@anvilwalrusden.com