MailIP Blacklist And Spamming

Top 5 users sending maximum emails on the server:

grep "<=.*P=local" /var/log/exim_mainlog | awk '{print $6}' | sort | uniq -c | sort -nr | head -5 eximstats /var/log/exim_mainlog | grep -A7 "Top 50 local senders by message count" | tail -5 | awk '{print $1,$NF}' Top 5 mail receivers: egrep "(=>.*T=virtual_userdelivery|=>.*T=local_delivery)" /var/log/exim_mainlog | awk '{print $7}' | sort | uniq -c | sort -nr | head -5

eximstats /var/log/exim_mainlog | grep -A7 "Top 50 local destinations by message count" | tail -5 | awk '{print $1,$NF}'

Script to check path for the script used for spamming

awk '{ if ($0 ~ "cwd" && $0 ~ "home") {print $3} }' /var/log/exim_mainlog | sort | uniq -c | sort -nk 1
awk '{ if ($0 ~ "cwd" && $0 ~ "home") {print $4} }' /var/log/exim_mainlog | sort | uniq -c | sort -nk 1

If there is large number of hits from an IP,block the IP

tail -n1000 /var/log/exim_mainlog |grep SMTP|cut -d[ -f2|cut -d] -f1|sort -n |uniq -c

Following command will show path to the script being utilized to send mail

ps -C exim -fH eww
ps -C exim -fH eww | grep home
cd /var/spool/exim/input/
egrep "X-PHP-Script" * -R

Shows the connections from a certain ip to the SMTP server

netstat -plan|grep :25|awk {‘print $5′}|cut -d: -f 1|sort|uniq -c|sort -nk 1

To shows the domain name and the no of emails in queue

exim -bp | exiqsumm | more

If spamming from outside domain then you can block that domain or email id on the server

pico /etc/antivirus.exim

Add the following lines:

if $header_from: contains “name@domain.com”
then
seen finish
endif


To Remove particular email account email

exim -bpr |grep “test.org”|awk {‘print $3′}|xargs exim -Mrm