This happens if you are trying to use PLAIN authentication for sendmail server. So check for this particular package and if it is missing then you might need to install it
cyrus-sasl cyrus-sasl-plain sasl
In case you are getting the below error
Oct 06 06:10:11 mail sendmail: error: safesasl(/usr/lib/sasl/Sendmail.conf) failed: World writable directory Oct 06 06:10:11 mail sendmail: error: safesasl(/usr/lib/sasl2 /libanonymous.so.2) failed: World writable directory Oct 06 06:10:11 mail sendmail: STARTTLS=server: file /usr/share/ssl/certs/sendmail.pem unsafe: World writable directory
# ls -ld /usr /usr/lib /usr/lib/sasl2 /usr/share /usr/share/ssl
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