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What is P.O. Box?

With rising spam levels entering users' email inboxes through class email lists, it was at last necessary to create some sort of system that will continue to allow list-driven emails to be sent to class rosters (not to mention majors lists, dorm lists, etc.) but will not allow spammers to target and flood those lists with unnecessary junk messages.

P.O. Box is a web-based interface that allows University students, staff, and faculty to interact with these mailing lists. Each mailing list has an owner who is initially given administrative privileges:
  • alter the description of the mailing list
  • change the attributes of the list (maintain an RSS feed, exclude the owner from mail delivery, etc.)
  • assign posting or administrative privileges to other members of the list
When posting a message, one or more lists may be selected as the recipient. Files can be attached to the message if necessary. The posted message is retained by the system through the end of the current semester: list members may log on to the system and peruse the list's posted messages at any time. A posted message can have one or more attachments (each of size 100.0 MB at most) with a total combined size of no more than 200.0 MB. All attachments are scanned for viruses prior to being made available for download.

Please direct all questions to the IT HelpCenter.

Network and Systems Services and the UD HelpCenter have done extensive testing to ensure that PO Box is compatible with a wide range of web browsers:

  Safari 2
Safari 3
Firefox 1.5 and higher
Opera 9.0 and higher
  OmniWeb 5.0 and higher
  Internet Explorer 7 and higher

RSS Feeds

RSS is a web feed data format that presents a subscriber with notification of new web site content as it becomes available, usually in the form of short blurbs describing the content. News services can use RSS feeds to provide article summaries, for example.

P.O. Box mailing lists are initially configured to have an RSS feed available; this can be disabled by list administrators. The feed contains the subject lines from posted messages, not the body of the posted messages. A student could subscribe to a class list feed in his or her RSS reader of choice (Safari and Firefox have RSS capabilities integrated into them) and be notified whenever a new message becomes available. This implies that a mailing list could be setup that doesn't actually send email messages! Since messages are retained on the server, list members can login at any time and view posted messages; and using the RSS feeds, those same list members can be notified when a new message has been posted.

Getting Help

P.O. Box features a context-sensitive help system: the actual help screens are tailored towards your capabilities, so you'll never see any more information than what applies to you. Look for the help button (shown in this section's headline, a question mark in a circle) and click it when you can't figure out what to do.

If you need help or have additional questions, please contact the IT Helpcenter via email or by calling 831-6000.


This software was designed and implemented by the University of Delaware Network and Systems Services group and makes use of the following packages1:

Apache web server ClamAV anti-virus scanning
PHP hypertext pre-processor PostgreSQL database server

Spell-checking support provided using the SpellerPages and GNU ASpell packages.
1 No endorsement of third-party software products is implied by their mention herein.

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