calum.org:~#

Search results for logs


Posts


Java logging
When things go wrong on Linux
On-demand streaming audio server
HOWTO: Linux and iSCSI
Live Amateur Radio contacts
Qubes
Cookies
systemd
How to run two instances of Tomcat on your machine
Playing with software defined networking
New site
Database caching in Java
Apache vs nginx?
Postfix Antispam
[Solved] Random hangs on HP EliteBook 8530W in Linux
Enjoyable development

Comments


You can do a log with it, like running the Kenwoodsoftware in Virtualbox or run Linuxsoftware like CQRLog. Bas - ON5HB
Of course, there'll always be some mail servers that don't follow the RFCs properly. Checking the logs, I noticed the following: Sep 26 03:11:47 hosting postfix/smtpd[19263]: connect from mail7.exchange.microsoft.com[131.107.1.27] Sep 26 03:11:49 hosting postfix/smtpd[19263]: NOQUEUE: reject: RCPT from mail7.exchange.microsoft.com[131.107.1.27]: 450 4.7.1 : Helo command rejected: Host not found; from= to= proto=ESMTP helo= Sep 26 03:11:49 hosting postfix/smtpd[19263]: disconnect from mail7.exchange.microsoft.com[131.107.1.27] Now, according to the SMTP RFC (http://www.ietf.org/rfc/rfc2821.txt): The domain name given in the EHLO command MUST BE either a primary host name (a domain name that resolves to an A RR) or, if the host has no name, an address literal as described in section 4.1.1.1. So why isn't there a DNS entry for df-gwy-07.exchange.corp.microsoft.com? Anyway, to allow these broken setups to skip the "reject_unknown_hostname" in "smtpd_helo_restrictions", (as I don't want to disable it - it catches 95% of the spam) - you need to do the following: * In main.cf, add parent_domain_matches_subdomains = yes * In the smtpd_helo_restrictions section, add "check_helo_access hash:/etc/postfix/helo_access" * In that helo_access file, list the offending "HELO/EHLOs" - in this case: .exchange.corp.microsoft.com OK * Finally, run postmap /etc/postfix/helo_access to build the DB file, and restart postfix. It does appear to be a problem more with some mail server admins than others. (https://www.nearlyfreespeech.net/about/email.php#software)