Email totification in RT

hi friends

i set up email notification for RT but just work with gmail in does not work with organization email
who can help me
thank you

Jul 17 12:10:42 support postfix/smtpd[4874]: warning: database /etc/aliases.db is older than source file /etc/aliases
Jul 17 12:10:42 support postfix/smtpd[4874]: connect from unknown[185.234.217.38]
Jul 17 12:10:43 support postfix/smtpd[4874]: lost connection after AUTH from unknown[185.234.217.38]
Jul 17 12:10:43 support postfix/smtpd[4874]: disconnect from unknown[185.234.217.38]
Jul 17 12:11:22 support postfix/smtpd[4874]: warning: hostname nowsms.endolar.com does not resolve to address 78.46.120.6
Jul 17 12:11:22 support postfix/smtpd[4874]: connect from unknown[78.46.120.6]
Jul 17 12:11:22 support postfix/smtpd[4874]: disconnect from unknown[78.46.120.6]