Last updated: 99.05.11
Email CommunicationThis document is available on the Internet at: http://www.barefeetware.com/email/imap/.
It was presented as a slide show at a Club Mac meeting in Sydney on 9 December 1998
The presentation is intended introduce some of the new email possibilities, especially with the wider adoption of the IMAP standard.
Presenter: Tom Brodhurst-Hill, Managing Director.
ProtocolEmail communication involves sending and receiving.
On the Internet this is done by:
- SMTP for sending.
- POP for receiving.
PortsSMTP = Simple Mail Transfer Protocol
POP = Post Office Protocol
Basically, they are just text transactions, with meaning such as:
You can actually get in at the low level communication via a telnet session.
- I am about to send a message.
- OK, go ahead.
- Here is the recipient address.
- OK, got it.
Limits of POPEach server protocol can operate on its own port number. Everyone usually uses the same port number for a particular service, eg:
Because SMTP and POP have different port numbers, the POP and SMTP servers can actually be run on the same computer, answering requests independently.
- 80 for Web
- 25 for SMTP
- 110 for POP
- 143 for IMAP
Proprietary AlternativesPOP is very limited as a method of receiving email.
It can basically only:
Some basic limits of POP are:
- Get a list of waiting email.
- Download those messages to the local hard disk.
- Delete them from the server.
- When you move from one workstation to another, your existing email is left behind.
- There is no way to share email between users of the same work group.
- Does not allow management of mailboxes stored on the email server.
IMAP to the RescueFor a business with a few users, or a few thousand users, POP is not enough.
Businesses often choose a proprietary email system such as MS Mail, MS Exchange, Netscape server, QuickMail or Communigate.
However, these proprietary systems come at a cost:
- Usually only one type of email client software can be used.
- Communication with the outside world (eg the Internet) is very difficult.
- Upgrades often require a transition period, retraining and a lot of down time.
SoftwareIMAP provides the best of both worlds:
It provides functionality such as:
- Uses established Internet standards.
- Provides the features required for collaboration, such as server storage.
- Messages are stored on the server.
- Off line copies of messages can be stored and synchronised with the server.
- As well as the INBOX, other mailboxes and directory structure can be maintained.
- Users can move from one workstation to another and still see all their email and mailbox structure.
- Several people in a work group can each access a shared account, and others can see immediate action.
- Drafts of outgoing messages can be stored on the server.
- Access privileges can be set for each user of a shared mailbox.
- Each message can have various flags set.
DemonstrationAlthough IMAP is a long established standard, software support, especially for the Mac OS, has only escalated fairly recently.Email Client Software
BareFeetWare has been comparing various available options.
An in depth and ongoing comparison of various Mac email clients appears at:
They include: Netscape Communicator, Outlook Express, Mulberry, Mailstrom, PowerMail, Simeon.
Time and technology permitting, a demonstration of an email client and server package will follow.
- AppleShare IP 6.1
- Mulberry 1.4
Please don't hesitate to contact us if you have any questions.
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