About the UoD SendTo Service...
Email messages with large attachments can wreak havoc on email servers and
end-users' computers. Downloading such email message can take hours on
a slow Internet connection and block any sending or receiving of messages
through the duration. In some cases, the download will fail repeatedly,
breaking the recipient's ability to receive mail at all. Also, Internet
email clients add considerably to the size of the file being sent. For
example, saving an Outlook Express message with an attachment adds
up to 40% to the file's size. To share files larger than 1MB, use the
UoD SendTo to temporarily make a file (or files) available to
another user across the Internet, in a secure and efficient manner.
There are two distinct kinds of users that will be accessing the
UoD SendTo system: inside
users, who are associated
with the organisation running the service, and outside
which encompasses the rest of the Internet.
user is allowed to create a drop-off that is
to be delivered to anyone, whether he or she be an inside
user. An outside
user is only allowed to
create a drop-off that is to be delivered to an inside
That prompts the question: what is a drop-off?
drop-off: one or more files uploaded to the UoD SendTo as a single entity for delivery to a user
There are two ways in which a user can dropoff multiple files at once:
Creating a Drop-off
- Attach each file individually on the dropoff page
- Archive and compress the files into a single package and attach
the resulting archive file on the dropoff page. There are many ways
to archive and compress files:
- Mac users can select the files in the Finder and Compress (see the File menu)
- Windows users can use WinZip
- Linux/Mac/Unix users, give the tar utility a try
When a user creates a drop-off, he or she enters some identifying
information about himself or herself (name, organisation, and email
address); identifying information about the recipient (name and email
address); and chooses what files should be uploaded to the Dropoff.
If the files are successfully uploaded, an email is sent to the recipient
explaining that a drop-off has been made. This email also provides a link
to access the drop-off, as well as the 16-character passcode that the user
must enter to gain access. Other information (the Internet address and/or
hostname from which the drop-off was created, for example) is retained,
so that the recipient can verify the identity of the sender.
Making a Pick-up
There are two ways to pick-up files that have been dropped-off:
When viewing a drop-off, the user will see quite a few things:
- All users can use the claim ID and passcode provided in the notification email message to access a specific drop-off.
- An inside user, once logged-in to the system, can display a list of all drop-offs waiting for him or her in the UoD SendTo. Once logged-in, an inside user is able to access drop-offs without the need for the passcode.
The recipient has 14 days to pick-up the files. Each night, drop-offs that are older than 14 days are purged from the system.
- The sender and recipient information that the sender entered when the drop-off was created
- The Internet hostname and/or address from which the drop-off was created
- The list of files that were uploaded
- A list of pick-ups that have been made
Please note that the uploaded files are scanned for viruses, but the
recipient should still exercise as much caution in downloading and
opening them as is appropriate. This can be as easy as verifying with
the sender mentioned in the notification email that he or she indeed made
the drop-off. One can also check the Internet hostname/address that was
logged when the drop-off was created, to be sure that it is appropriate
to the sender's Internet domain; IP addresses can
be faked, though,
so the former identity verification is really the most failsafe.
Resumable Downloading of Files
Some web browsers support resumable downloads
. Imagine this
scenario: you're sitting at your local coffee shop, downloading a 50MB
PDF that a student uploaded to UoD SendTo for you.
Suddenly, someone a few tables away starts watching the latest HD movie
trailer (well, attempting to, anyway) and your wireless connection drops
— you were 45MB into the download, and now you have to start over!
Not so, if your browser supports resumable downloads
; in which
case, the browser requests only the remaining 5MB of the file.
UoD SendTo features support for the server-side components
of resumable download
technology under the HTTP 1.1 standard.
If you're a Safari, Opera, or OmniWeb user then rest assured, you can
resume interrupted downloads, we've tested it!
Size Limitations on Uploads
Being able to upload files larger than 2 GB depends on the browser being used. The following major browsers have been tested:
The UoD SendTo software itself has limits on the amount of
data that can be uploaded in a single dropoff. Even for browsers
that support uploads larger than 2 GB, dropoffs may not exceed
64.0 GB per file, or 64.0 GB total for the entire dropoff.
If you are having the following issues when dropping-off or picking-up a large file:
- Your browser reports a bad or broken connection after downloading a significant portion of the file
- An error page is displayed that indicates you dropped-off no files
then you are most likely connected to the Internet via a connection too
slow to move the amount of data in a timely fashion. Your computer has
approximately 2 hours to fully send or receive a dropoff.
Based upon the original Perl UD Dropbox software written by
Doke Scott, updated and developed by Julian Field.
Based on ZendTo developed by Julian Field
Site Design by University of Dundee