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linux:email [2020/09/23 08:57]
seanburns removed
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-<markdown> 
-# Email basics 
-## Wed 28 Nov 2018  
  
-## Historical influences 
- 
-Email was originally based very much on the office memorandum, which is 
-structured with fields like so: 
- 
-- To: 
-- From: 
-- Date: 
-- Subject: 
-- Content (DATA) 
- 
-## Email servers and clients 
- 
-1. Store and forward 
-    - messages are stored and forwarded when appropriate 
-2. Email servers  
-    - accept, forward, deliver, store messages 
-3. Email clients 
-    - connect to email servers to send messages or retrieve messages 
- 
-- MUA, mail user agent. From email client to: 
-- MSA, mail submission agent. The SMTP server does a: 
-- DNS server lookup. From DNS to: 
-- MTA, mail transfer agent. The SMTP server to: 
-- Remote server. The remote server: 
-- MDA, mail deliver agent to remote mailbox. 
-- MUA, mail user agent, reads email. 
- 
-## Email headers 
- 
-See RFC 5322: https://tools.ietf.org/html/rfc5322 
- 
-Some important headers: 
- 
-### Originator fields 
- 
-These three could be the same or different: 
- 
-- from: the author of the message 
-- sender: the person sending the message 
-- reply-to: reply messages sent to this person 
- 
-### Destination address fields 
- 
-- to: the primary recipient 
-- cc: (carbon copy), secondary recipients 
-- bcc: (blind carbon copy), multiple uses 
- 
-### Identification fields 
- 
-- message-id: a unique identifer 
-- in-reply-to: a unique follow up identifier 
- 
-### Informational fields (human readable) 
- 
-- subject:  
-- comments: 
-- keywords:  
- 
-Important comment on "Re:", Latin for "In the matter of" -- this is application 
-dependent and not required. 
- 
-## Message body / Data 
- 
-- ASCII, American Standard Code for Information Interchange: character encoding 
-- MIME, Multipurpose Internet Mail Extensions 
-    - non-ASCII text 
-    - non-text 
-    - and more 
- 
-MIME file (~/.mailcap) on my system: 
- 
-``` 
-image/*; eog '%s' 
-text/html; w3m -I %{charset} -T text/html; copiousoutput; 
-audio/*; cvlc '%s' 
-#application/pdf; evince '%s' 
-application/pdf; mupdf '%s' 
-application/force-download; evince '%s' 
-application/x-msword; soffice --nologo --writer '%s' 
-``` 
- 
-## Email Security 
- 
-Some issues: 
- 
-- Spam 
-- Malware 
-- Phishing 
-- Spoofing 
-- Privacy 
-    - lack of encryption 
-    - intermediate systems 
-    - storage issues on remote systems 
-    - metadata 
-</markdown> 
linux/email.1600865821.txt.gz ยท Last modified: 2020/09/23 08:57 by seanburns