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Sharp Electronics (UK) Ltd., NIS Systems Support 

 

NIS Bulletin 055.doc 

 

Page:  5 of 7 

 
Symptom:  
Mail gets returned to the "reply-to" address with an error message. 
 
The invalid recipient can be shown in a couple of ways.  

1. 

You may get a "User Unknown" error if the recipient's account does not really exist.  

2. 

You may get an error stating that you are not allowed to send that recipient an e-mail 
message (This can happen if your mail administrator has restricted who can send messages 
to the internet). 

3. 

If the domain being sent to does not exist. 

 
Solution:  
Because there are a variety of causes of this, there is no one fix-all solution, however, it is 
recommended that the "reply-to" address is set to an account that someone can check to find out 
what type of error has occurred.  Most of the time, invalid recipient errors do not create an error at the 
time that the scanner sends the e-mail. 
 

 
Symptom:  
Mail gets received but no scan is attached, mail gets returned to "reply-to" address with an error 
message, or mail simply never arrives at destination. 
 
This occurs when the mail administrator has filtered out mail attachments.  The mail administrator 
may do this to prevent viruses from entering the network. 
 
Solution:  
Either have the mail administrator unblock attachments sent by the scanner, or use the Scan-to-FTP 
and the "e-mail URL link" options of the scanner. 
 

 
This can encompass a variety of issues. 

1. 

If your e-mail server is entered by name rather than IP address in the configuration of the 
scanner, the DNS setting on the scanner must be correct and the DNS server must be able to 
resolve that mail server's name to it's correct IP address. 

2. 

Also, if the mail server requires that the relay client's IP address be resolvable (in this case 
the scanner's IP address), the scanner must be listed in the DNS server that the mail server is 
using, or in the "hosts" file of the mail server. 

3. 

If the mail server further requires that the "sender domain" be resolvable, the "reply-to" 
address set in the scanner must have a valid domain name. 

 
Solution:  
Make sure all IP addresses are listed in the DNS and that the "reply-to" address has a valid internet 
domain name, or specify everything by IP address. 
 

 

Sharp Electronics (UK) Ltd., NIS Systems Support 

 

NIS Bulletin 055.doc 

 

Page:  6 of 7 

 
To verify that all these pieces are working correctly, and to try to determine where a breakdown 
occurs, you may take the following steps: 
 

1. 

Unplug the scanner, and plug a PC into the Ethernet cable from the scanner. 

2. 

Set the PC's IP address to the same as that of the scanner. 

3. 

Go to "start", then "run", and type in "telnet" and hit enter. 

4. 

If you are running Windows 2000, skip to Windows 2000 instructions on page 4 here. 

5. 

When you get the telnet window, go to the "Terminal" menu and select "Terminal 
Preferences" 

6. 

Check the "Local Echo" checkbox, then press OK. 

 

 

7. 

Go to the "Connect" menu and select "Remote System" 

8. 

Type in the name or IP address of your mail server and set the PORT to 25, then press 
"Connect" 

 

 

9. Type 

the 

following: 

HELO <DNS name or hostname of scanner here>  
MAIL FROM: <reply-to address set on scanner here>  
RCPT TO: <recipient's e-mail address here>  
DATA 
<Type some sort of message here> 
<Put a period on a line by itself here at the end of your message> 

 

 

Sharp Electronics (UK) Ltd., NIS Systems Support 

 

NIS Bulletin 055.doc 

 

Page:  7 of 7 

 

10.  You should see something like the following: 

 

 

11.  If you receive an error message at any of these points, it should give you some sort of idea 

what the problem is. 

12.  Type QUIT to exit the session. 

 

5. 

At the "Microsoft Telnet>" prompt, type the following commands:  
set LOCAL-ECHO  
open <mailserver name or IP address here> 25 

6. 

Return to step 9 and continue. 

 

 

Sharp Electronics (UK) Ltd., NIS Systems Support 

 

NIS Bulletin 055.doc 

 

Page:  7 of 7 

 

10.  You should see something like the following: 

 

 

11.  If you receive an error message at any of these points, it should give you some sort of idea 

what the problem is. 

12.  Type QUIT to exit the session. 

 

5. 

At the "Microsoft Telnet>" prompt, type the following commands:  
set LOCAL-ECHO  
open <mailserver name or IP address here> 25 

6. 

Return to step 9 and continue.