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SMTP Server blocked by csf and throwing error

LOG: MAIN
cwd=/usr/local/cpanel/whostmgr/docroot 4 args: /usr/sbin/exim -v -M 1jsyQF-0002B0-JY
delivering 1jsyQF-0002B0-JY
LOG: MAIN
Sender identification U=keralad1 D=keraladesk.com S=info@dummydomain.com
Connecting to how.lakemneadows.com [1.1.1.1]:25 ... failed: Connection refused
LOG: MAIN
H=how.lakemneadows.com [1.1.1.1] Connection refused
LOG: MAIN
== marylynhooten4@how.lakemneadows.com R=lookuphost T=remote_smtp defer (111): Connection refused

i disabled csf and tried to send emails and its working fine.

Check the log /var/log/maillog and check in there what error shows for you IP.

Sergio