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RFC1820 - Multimedia E-mail (MIME) User Agent Checklist

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

Network Working Group E. Huizer

Request for Comments: 1820 SURFnet bv

Category: Informational August 1995

Multimedia E-mail (MIME) User Agent Checklist

Status of this Memo

This memo provides information for the Internet community. This memo

does not specify an Internet standard of any kind. Distribution of

this memo is unlimited.

Abstract

This document presents a checklist to facilitate evaluation of MIME

capable User Agents. Access to a MIME test-responder, that generates

test-messages is described.

IntrodUCtion

This document presents a checklist that facilitates evaluation of

MIME capable E-mail User Agents. It is by no means a conformance or

interoperability (both strictly defined and measurable quantities)

checklist, but rather an interworking (practical perspective)

checklist that is aimed at the users and system managers.

Usage and submission

If you use this checklist against a specific product (regardless of

whether you're a vendor, implementor or user) you can submit the

result to mime-check@relay.surfnet.nl and this information will be

made available (at no cost) through WWW (to be announced) for other

people to browse through.

Although SURFnet will attempt to verify the correctness of each

submission, all submitted, information is made available as is, with

no guarantees (SURFnet does not take any responsibility for errors in

the data that is made available, or for any damages resulting from

usage of that data). Users who want to procure a UA are advised to

use the data as an orientation, and to perform their own procurement

tests (possibly using the checklist below as a guideline). Also it is

noted that vendors and implementors are encouraged to use the results

from the checklist to improve their products.

Getting test messages

For several tests in the checklist a test message is required. Test

messages can be requested in the following way: Send mail to <mime-

test@relay.surfnet.nl> with a subject field containing ONE of the

following:

text/plain

text/enriched

image/gif

image/jpeg

audio/basic

video/mpeg

application/octet-stream

application/postscript

message/rfc822

message/partial

message/external

multipart/mixed

multipart/parallel

multipart/digest

multipart/alternative

application/Wordperfect5.1

application/msword

application/rtf

X-local <to test how your UA deals with undefined content-types>

nested <returns a message that contains nested multipart contents>

iso-8859-1 <returns a message with text/plain; charset=iso-8859-1>

A message containing the requested content-type will be returned to

the address contained in the from field.

References

The reader is encouraged to also check out the following references:

The MIME standards:

- Borenstein N. and N. Freed, "MIME (Multipurpose Internet

Mail Extensions) Part One: Mechanisms for specifying and

describing the format of Internet message bodies", RFC1521,

Bellcore, Innosoft, September 1993.

- Moore K., "MIME (Multipurpose Internet Mail Extensions) Part

Two: Message header extensions for non-Ascii text", RFC1522,

University of Tennessee, September 1993.

The registration procedure for content types:

- Postel J., "Media type registration procedure", RFC1590,

USC/Information Sciences Institute, March 1994.

Some related informational documents:

- Borenstein N., "The text/enriched MIME content-type",

RFC1563, Bellcore, October 1994.

- Borenstein N., "A user agent configuration mechanism for

multimedia mail format information", RFC1524, Bellcore,

September 1993.

Registered MIME content-types can be found at the following URL:

FTP://ftp.isi.edu/in-notes/iana/assignments/media-types/media-types

The SUNet MIME project: http://www.chalmers.se/SUNET/Mac-E.Html This

offers evaluation tests reports of MIME products, as well as tests

and test-criteria for MIME implementors.

From Stockholm University a list of user-interface requirments for a

mail/news reader is available under: gopher://mars.dsv.su.se/11/dsv-

reports/research-reports/messaging- research

Checklist for Mime UAs

(note that for items with multiple choice options, it is possible

that more than one option is applicable)

1. General information:

1.1 The name and version of the product

1.2 The name and addressing information of the manufacturer

1.3 What are the platforms that are supported (Operating system,

GUI and hardware requirements, if applicable: what APIs are

supported (like MAPI etc.))? [Note: Please use separate

checklist forms for different platforms!!]

1.4 What is the platform that was used for this checklist

(Operating system, GUI and hardware)? [Note: Only one

platform per checklist!!]

1.5 Is the software available in source format or in binary

format or both.

1.6 Pricing information. Is the software available:

- In the Public Domain, free of charge

- As shareware (what is the price?)

- PD for non-profit use, but not for commercial use

- Commercially

2. System installation, configuration and management

2.1 How complex/easy is installation and configuration? Are

there any pitfalls that need attention? Can you configure

per set of users (i.e systemwide or LAN wide default

configuration) and/or per user?

2.2 Are there facilities for logging and/or accounting?

2.3 Does the UA generate correct RFC822 headers for outgoing

messages:

From:, (and if necessary) Sender:

Date:

Message-id:

2.4 Is it possible for a non-priviledged user to change the

"from" and/or "sender" field?

2.5 Does the UA have any size restrictions (default or applied

by system manager) for:

- Message size

- Number of messages

- Number of folders

- Number of messages per folder

2.6 How secure is the users mailbox when using this UA? Can

other non-privileged usets access the mailbox?

2.7 What is the performance of the UA on this platform? (As this

is difficult to measure, give your subjective impression:

slow, reasonable or fast) E.g for:

- Displaying a text message

- Displaying a MIME message that contains an image

- Complex actions like sorting etc.

3. General UA properties

3.1 Does the UA have a graphical or a character based interface

or both?

3.2 Does the UA support native RFC822/MIME or does it require a

gateway?

3.3 Which protocols are supported for message delivery:

a. SMTP (MX records or static routing to Mailhost)

b. ESMTP

c. POP (which version)

d. IMAP

e. Co-location with specific MTA (which MTA)

f. Other ...............

3.4 Which protocols are supported for message submission:

a. SMTP

b. ESMTP

c. Co-location with specific MTA (which MTA)

d. Other ...............

3.5 Does the UA support the following basic functionalities:

- List messages

- Read messages

- Delete messages

- Compose new messages

- Reply to messages (Inclusion of original message-text in

reply, reply to originator or to any or all recipients

etc.)

- Forward message

o using MIME

o using RFC934 encapsulation; i.e. message is

encapsulated in between:

------- Forwarded Message and

------- End of Forwarded Message

o Other .......

- Distribute message (the from field does not change)

3.6 Does the UA support the following header fields and can they

be supplied by the user:

Generated correctly Can be supplied by user

- To:

- Cc:

- Bcc:

- From:

- Reply-to:

- Subject:

- Comments:

3.7 Does the UA support filing mail into folders? Are there any

restrictions?

3.8 Does the UA support a filtering mechanism that allows the

user to configure automatic processing of incoming mail

(e.g. automatic filing into specific folders)? If so, how

simple is the configuration of these filters?

3.9 Does the UA support a sorting mechanism that allows the user

to sort mail on date and/or subject and/or from field etc?

If so describe the possibilities and restrictions.

3.10 Does the UA support address lists and/or Directory services?

- Local (local address list, local aliases, local distribution

lists etc.)

- Whois++

- Ph (to CCSO server)

- LDAP or SOLO or other access protocols to a directory

service

- Other .....

3.11 What other non-multimedia facilities does the UA support?

3.12 What secure mail protocols does the UA support (in-line):

- PEM (Privacy Enhanced Mail)

- PGP (Pretty Good Privacy)

- Other.....

4. MIME support

4.1 Does the UA support:

- viewing a MIME content (either in-line or through launching

an external viewer)?

- saving a MIME content in a file?

- saving one part of a multipart message in a file?

- printing a MIME content?

4.2 Does the UA support receipt of the following basic MIME

content types? Does it display them in-line and does it

support printing of such a content type? If an external

viewer is needed, is a viewer pre-configured? Is the viewer

included in the software distribution?

In-line Printing External Preconfig Included

- text/plain

- text/enriched

- image/gif

- image/jpeg

- audio/basic

- video/mpeg

- application/octet-stream

- application/postscript

- message/rfc822

- message/partial

Does the UA support ftp and/or mail access for:

- message/external

Describe how the UA supports the basic multipart types:

- multipart/mixed

- multipart/parallel

- multipart/digest

- multipart/alternative

How does the UA handle:

- X-<bilateraly defined>

- unknown/unconfigured content-types

4.3 Does the UA allow configuration for receipt of additional

content-types? If so describe the configuration procedure

and possibilities. (Is it complex/easy, give example

configuration, can you add external viewers etc.). E.g.

- application/wordperfect5.1

- application/msword

4.4 Does the UA support composition of the following basic MIME

content types? Describe how easy/complex composition of a

message with a MIME content-type is.

- text/plain

- text/enriched

- image/gif

- image/jpeg

- audio/basic

- video/mpeg

- application/octet-stream

- application/postscript

- message/rfc822

- message/partial

- message/external

- multipart/mixed

- multipart/parallel

- multipart/digest

- multipart/alternative

Does the UA generate X-<bilaterally defined> content-types

(when and why)

4.5 Does the UA support compostion of additional content-types?

If so describe how to do this (configuration and/or

compostion), e.g.:

- application/wordperfect5.1

- application/msword

4.6 What content-encodings does the UA support:

- 7bit

- quoted printable

- base64

- binary

- 8bit

- X-<bilateraly defined> (when and why)

4.7 What encoding is used for the following content-types:

7bit QP B64 Binary 8-bit Other

- text/plain

- text/enriched

- image/gif

- image/jpeg

- audio/basic

- video/mpeg

- application/octet-stream

- application/postscript

- message/rfc822

- message/partial

- message/external

- multipart/mixed

- multipart/parallel

- multipart/digest

- multipart/alternative

4.8 Does the UA generate the correct Mime version header:

Mime-Version: 1.0

4.9 In multipart messages, give an example of the sort of

boundary string generated.

4.10 Does the UA support the use of non-ascii characters in the

headers (in subject, free form part of address etc.)?

4.11 With the content type text/plain it is possible to have a charset

parameter, indicating that a specific character set is used in

the content type text plain. What character sets (like

iso-8859-1) does the UA support (standard or configurable)?

Security Considerations

Testing a MIME UA against this checklist involves the security risks

that are described in the MIME specification (RFC1521). Most notably

the automatic execution of general-purpose PostScript interpreters

entails serious security risks. The reader is encouraged to read RFC

1521 for more detail on these security risks.

Author's Address

Erik Huizer

SURFnet bv

P.O. Box 19035

3501 DA Utrecht

The Netherlands

Phone: +31 30 305305

Fax: +31 30 305329

 
 
 
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