Ken's Tech Note

Problem: To extract e-mail address of the incoming mail. Analysis: 1. The e-mail address are stored in .mbox format in macOS. The .mbox for Mac is essentially an archive (can be opened and what is useful in this exercise is the file called filename .mbox). It is a .txt file. 2. Email have standard header info which contains the sender information. e.g. an e-mail header would look something like this: (information masked for privacy) From sender@example.com Fri Dec 16 00:11:30 2016 Delivered-To: recipient@domain.com Received: by IP address with SMTP id hm4csp533342wjb;         Fri, 16 Dec 2016 00:11:30 -0800 (PST) X-Received: by 10.157.51.53 with SMTP id f50mr1243482otc.34.1481875890678;         Fri, 16 Dec 2016 00:11:30 -0800 (PST) Return-Path: Received: from gateway21.websitewelcome.com (gateway21.websitewelcome.com. [IP address])         by mx.google.com with ESMTPS id r129892oib.209.2016.12.16.00.11.30         for         (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 b

ClamAV requires quite a bit of resources to run in the background and this usually slows down the mail delivery. In the ISPConfig 3 (Under Perfect Server setup), clamAV is run within Amavis. Therefore, typical removal of clamAV commands will not remove it. When RAM is really low, Linux kills amavis and this will cause mail not being delivered. Therefore, if we run amavis to manage anti-virus and spam, consider a minimum of 2G or 4G RAM VM/Cloud servers. The steps to disable clamav and amavisd are: (1) edit postfix conf - note amavis uses a special port 10024 and 10026. Therefore, if you are not using these ports, consider closing them in your firewall settings. nano /etc/postfix/main.cf # content_filter = amavis:[127.0.0.1]:10024 # receive_override_options = no_address_mappings (2) Under ISPConfig 3.1, comment additional 2 lines nano /etc/postfix/tag_as_foreign.re # /^/ FILTER amavis:[127.0.0.1]:10024 nano /etc/postfix/tag_as_originating.re # /^/ FILTER amavi