IST346 – Email Servies Agenda  What is email?  Email Policies  The technical side of Email  Components  Protocols  Email architecture  Email Security.

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Presentation transcript:

IST346 – Servies Agenda  What is ?  Policies  The technical side of  Components  Protocols  architecture  Security  SPAM

What is ?  A means to exchange messages and data on the internet.

– a IT manager’s personal nightmare? Technology Issues Policy Issues  Uses a lot of storage.  Complicated service  Requires a lot of servers to operate at scale  Illegitimate – SPAM  Not very secure  Easy to “spoof”  ECPA compliance- requires consent, being employed is consent  Archival policy  Subponeanas – pulling s from backups for a court order  Employees use company property And despite all of this, everyone must have !

Organizational policies for  Policies governing personal use of corporate  Confidentiality / Ownership / Disclosure  Employee is using the company’s property.  Sometimes the policy is “injected” into the outgoing message.  mics/ - funny take :-) mics/

Getting technical regarding Service dependencies, components, and how it works.

Anatomy of - components Protocols IMAP4, POP3,SMTP Components MUA, MTA, Delivery Agent (DA), Access agent (AA), Message Store. APIs SMTP, MIME, Various RFC’s

Service Dependencies IMAP4, POP3, SMTP DNS, DHCP, LDAP Application Network / Transport Core Infrastructure

Components  MUA – Mail user agent. This is usually a client like Outlook, Thunderbird, or a web browser (in the case of , for instance)  MTA – Message transfer agent. Sends mail around the internet, from domain to domain. (Eg. Sendmail, exim, exchange, postfix)  DA - Delivery agent. Writes mail to the mail message from the MA to the message store. (Eg. procmail, exchange)  AA - Access agent. Exposes a protocol so users can read mail from the message store. Access protocols are POP3 and IMAP4 (Eg. pop3d, imapd, exchange)

Components at work – sending MUA iMail MUA Phone MUA Outlook MTA sendmail syr.edu internet Message Store DA procmail MTA sendmail gmail.com Example of sending an from to

Components at work – receiving MUA iMail MUA Phone MUA Outlook AA imapd syr.edu internet Message Store MTA sendmail DA procmail Example of receiving an from anywhere to

addresses, Namespaces, and You !  Format:  Domains use MX records in DNS not A records. This is how mail from northpole.org knows where which server to send to syr.edu  dig syr.edu MX  MTA’s will accept mail even if the mailbox does not exit. DA will reject it if the mailbox is not found.  “Undeliverable”

SMTP Protocol in Action The “S” in SMTP stands for “Simple”.

What’s in an message? Envelope Headers Body