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WELCOME ABOARD ...  

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See below: once you have this down the rest is math basically ... complex questions require complex learning

1. locate and read your webserver's access log --make sure that images are being recorded --fix that first
2. load the image from you server in the email
3. STEP 1; email yourself at gmail and other common public accounts you mail to
4. see your webserver access log
   a.) use grep in a terminal to find the access log lines that contain that image name request
   b.) look at the IP address that loads it each time
   c.) get the hostname (reverse DNS [PTR]) of each request
5. STEP 2; Now open the email like a normal user would
   REPEAT 4^above observe what the log says

This is the best way to get your answer --know what you are doing.

You need root access to add images to the log if they are not there

Skills required:

ssh

ls

whereis

grep

[CODE=bash]#server configuration

@DS-11:~$whereis (apache2|nginix|other)

@DS-11:~$ cd /etc/apache2

@DS-11:/etc/apache2$ ls

apache2.conf conf-available  conf-enabled  envvars  magic  mods-available mods-enabled  ports.conf  sites-available  sites-enabled

#logs

$ cd /var/log/apache2

@DS-11:/var/log/apache2$ ls

access.log  error.log  error.log.1  other_vhosts_access.log

$ grep 'image.jpg' access.log

$ grep 'image.jpg' access.log|tac|cat -n|less

#read the grep line by line in reverse (by last time requested)[/CODE]