Why am I getting this "Undelivered Mail Returned to Sender" message?
firstname.lastname@example.org: host mail.cs.rutgers.edu[188.8.131.52] said: 551 78005042
We dont accept this type of mail. See
(in reply to end of DATA command)
What should I do if you suspect my computer has been infected by a
If you are a Rutgers affiliated person, you are in luck. Rutgers have site-licensed
Anti Virus software and is available to Rutgers students, faculty and staff. This virus software
is available at: http://software.rutgers.edu under
the name RADS (Rutgers Antivirus Delivery System)
We strongly recommend you install the antivirus right a
Why haven't I seen these virus warnings before ?
We had been suppressing
the warning messages previously but some people have been wondering
what happened to their sent messages and prefer to be notified when they are sending messages that
contains viruses or suspicious file. To avoid confusion, we are now
rejecting email immediately if objectionable content is found and
leave it to sending server to notify the sender.
What are Blocked Autoexecutable,
Suspicious or Unsafe Attachments?
An e-mail virus can be
delivered (especially to Windows machines) via a number of clickable
attachments or by autoexecutable enclosures - which activate when the
message is read or sometimes previewed. Our virus scanner checks all
email sent to any mail addressed to cs.rutgers.edu (e.g.
"email@example.com".) It rejects any mail that has UNSAFE file
types included in it (see below). If you send or receive mail with
unsafe enclosures, you will receive notification as described above.
We block email with suspicious
attachments to avoid accidental mistake. Many viruses are sent with
these extensions hidden from user. For example, an email attachments
may come under the following name:
"readme.doc.exe". Because the default setting on a Windows Operating system is not to show known
file types, the enclosure above may look like
to users. Opening this enclosure will execute file
without a user's knowledge and infect a user's computer.
To prevent the spread of viruses
delivered via email, all email destined to anyone at cs.rutgers.edu
are being scanned. If your email contains attachment(s) with any
extension listed below, you email will be rejected by our mail server
and will be returned with the error message above.
The following UNSAFE file
types are known to be used for spreading viruses or creating security
holes and are currently being blocked if their sizes are less or equal to 1MB in size.
Access Project extension
.ADP Microsoft Access Project
.ADB Microsoft Access Database
.ASP Active Scripting program
.BAS Basic file
.BAT Batch file
.CHM Compiled HTML
.CMD WindowsNT/2000 Command script
.COM executable file
.COMMAND executable file
.CPL control panel file
.CRT Security Certificate
.EXE executable file
.HLP Windows Help File
.HTA HMTL Applications
.INF Setup Information File
.INS Internet Communication Settings
.ISP Internet Communication Settings
.JS Java Script file
.JSE JScript Encoded Script File
.MDE Microsoft Access MDE Database
.MSC Windows Common Console Document
.MSI Windows Installer Package
.MSP Windows Installer Patch
.MST Microsoft Visual Test Source files
.PCD Photo CD Image, Microsoft Visual Compiled
.PIF Program Information File
.REG Registry file
.SCR Screen Saver
.SCT Windows Script Component
.SHS Shell Scrab Object
.URL Universal Resource locator file
.VB Visual Basic file
.VBE Visual Basic Encoded Script file
.VBS Visual Basic script
.WSC Windows Script Component
.WSF Windows Script File
.WSH Windows Script Hosting Settings File
Newly Added Unsafe Extension following Office 2000 Service Pack
.APP Visual FoxPro
.FXP Visual FoxPro compiled program
.PRG Visual FoxPro program
.MDW Microsoft Access Workgroup Information
.MDT Microsoft Access Workgroup
I need to send sensitive file and now I can't send encrypted zip files. What
do I do?
encryptred zip/rar files are blocked, if you MUST send encrypted
compressed attachments via email, we recommend using gzip
to create .gz or .gzip format. Other recommended
program is Stuffit.
StuffIt will create .sit file.
extensions (.gz, .gzip) are considered safe currently
and are not blocked by most virus filters including ours. Please note
that these compressed file are not immune from viruses.
A good rule
of thumb is to always verify with the sender when you get an email
do I protect myself against email viruses (such as
The best way to
exchange files is probably by NOT sending the files in email.
Other than the attachment could be blocked, many people may not be
able to receive the files you were sending due to disk space
restrictions. Many mail servers have limited disk quotas and your
email may be rejected if the recipient is running out of space.
1. A good
alternative to sending files in email is storing
files in your personal website. This
is the prefered method of file
sender has a website where such files can be stored. In this method,
you would send the web site address (URL) and let the recipient of
the email retrieve the file him or herself. To add to its benefit,
can also password protect access to your
share only to those who knows the password.
2. Other alternative to transfer files is to use an anonymous FTP service
Science machines. This method allows your colleage to drop or get
files in your predefined folder. For more instruction how to set up
this folder see http://www.cs.rutgers.edu/~watrous/anonymous-ftp.html