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Linux find and replace for lines containing specific text

I need to change MX records across a large amount of domains and I am looking for a script to automate the process. The problem lies in that I need to change the MX record, but not cname records. For example:

From
@          IN          MX          100       mail.somedomain.com
@          IN          MX          100       mail.somedomain.com
mail1      IN          CNAME                mail.somedomain.com
mail2      IN          CNAME                mail.somedomain.com

To
@          IN          MX          100       mail.newdomain.com
@          IN          MX          100       mail.newdomain.com
mail1      IN          CNAME                mail.somedomain.com
mail2      IN          CNAME                mail.somedomain.com

So basically I need something that says go through every file in this folder and look for lines containing MX. On those lines, replace mail.somedomain.com with mail.newdomain.com
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avizit
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ozo
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awk '$3=="MX"{sub("mail.somedomain.com","mail.newdomain.com")}{print}'
 < From > To
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shoaibbhatti007
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sed 's/mail.somedomain.com/mail.newdomain.com/' MX_file > tmp_file
mv tmp_file MX_file
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shoaibbhatti007
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perl -pi -w -e 's/mail\.somedomain\.com/mail\.newdomain\.com/g;' *
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Worked beautifully, thanks