block a particular domain exim block Ratelimit

 Warning: "Increment slow_fail_block Ratelimit because of all messages failed"

F= rejected RCPT

Home »Service Configuration »Exim Configuration Manager
Advance Editor > Add additional configuration setting

domainlist exim_blacklist = lsearch;/etc/eximblacklist

Under ROUTERS CONFIGURATION  

reject_domains:
driver = redirect
# RBL Blacklist incoming hosts
domains = +exim_blacklist
allow_fail
data = :fail: Connection rejected: SPAM source $domain is manually blacklisted.

#cat /etc/eximblacklist
alerts.hmrc.gov.uk
hmrc.gov.uk

Pidgin error : No authentication method

When I am try to connect my Pidgin, I got the following error message.

 Server does not use any supported authentication method

When I look into hosts file, it was:
 ajeesh@tech12:~$ cat /etc/hosts
127.0.0.1       localhost
127.0.0.1       tech12.ajeesh.net

hostname,  file it was
ajeesh@tech12:~$ hostname
tech12
So I have changed the host file as follows and this fixed my Issue.
root@tech12:# cat /etc/hostname
tech12.ajeesh.net