いつもお世話になります。
現在下記環境でpostfixを用いてメールの送受信を行っているのですが、受信するたびにmaillog(/var/log/maillog)に下記のようなエラーが出現してしまいます。メールの送受信自体はできているのですが、なぜこのエラーが出るかをご教示いただけませんでしょうか。
よろしくお願いいたします。
Linux : Amazon Linux AMI release 2017.03
postfix: 2.6.6
/var/log/maillog Nov 24 13:34:18 aed01 postfix/smtpd[14671]: warning: 191.96.XXX.XXX: hostname smtp29.digitalsearchengine.in verification failed: Temporary failure in name resolution Nov 24 13:34:18 aed01 postfix/smtpd[14671]: connect from unknown[191.96.XXX.XXX] Nov 24 13:34:20 aed01 postfix/smtpd[14671]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory Nov 24 13:34:20 aed01 postfix/smtpd[14671]: warning: unknown[191.96.XXX.XXX]: SASL LOGIN authentication failed: generic failure Nov 24 13:34:20 aed01 postfix/smtpd[14671]: disconnect from unknown[191.96.XXX.XXX] Nov 24 13:34:33 aed01 postfix/smtpd[14450]: warning: 191.96.XXX.XXX: hostname smtp29.digitalsearchengine.in verification failed: Temporary failure in name resolution Nov 24 13:34:33 aed01 postfix/smtpd[14450]: connect from unknown[191.96.XXX.XXX] Nov 24 13:34:35 aed01 postfix/smtpd[14450]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory Nov 24 13:34:35 aed01 postfix/smtpd[14450]: warning: unknown[191.96.XXX.XXX]: SASL LOGIN authentication failed: generic failure Nov 24 13:34:35 aed01 postfix/smtpd[14450]: disconnect from unknown[191.96.XXX.XXX] Nov 24 13:34:38 aed01 postfix/smtpd[14671]: warning: 46.148.XX.XXX: hostname dapper.hosted.by.invps.net verification failed: Temporary failure in name resolution Nov 24 13:34:38 aed01 postfix/smtpd[14671]: connect from unknown[46.148.XX.XXX] Nov 24 13:34:39 aed01 postfix/smtpd[14671]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory Nov 24 13:34:39 aed01 postfix/smtpd[14671]: warning: unknown[46.148.XX.XXX]: SASL LOGIN authentication failed: generic failure Nov 24 13:34:53 aed01 postfix/anvil[14049]: statistics: max connection rate 3/60s for (smtp:191.96.XXX.XXX) at Nov 24 13:34:33 Nov 24 13:34:53 aed01 postfix/anvil[14049]: statistics: max connection count 1 for (smtp:46.148.XX.XXX) at Nov 24 13:25:33 Nov 24 13:34:53 aed01 postfix/anvil[14049]: statistics: max cache size 3 at Nov 24 13:28:18

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2017/11/27 06:31