centos virtualmin mail is not sending.

hi, i have a centos server with vitualmin, i was trying to set it up to send in wordpress. now it works with wordpress but the mails are in the queue and they are not being sent. i checked the logs. i found this in the "secure" log: var/log/ Apr 10 04:37:25 cp saslauthd[679]: pam_unix(smtp:auth): check pass; user unknown Apr 10 04:37:25 cp saslauthd[679]: pam_unix(smtp:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost= Apr 10 04:37:30 cp saslauthd[681]: pam_unix(smtp:auth): check pass; user unknown Apr 10 04:37:30 cp saslauthd[681]: pam_unix(smtp:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost= Apr 10 04:37:47 cp saslauthd[680]: pam_unix(smtp:auth): check pass; user unknown Apr 10 04:37:47 cp saslauthd[680]: pam_unix(smtp:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost= and this in the "maillog": Apr 10 07:12:36 cp postfix/master[1578]: warning: process /usr/libexec/postfix/smtp pid 29024 exit status 1 Apr 10 07:12:36 cp postfix/master[1578]: warning: /usr/libexec/postfix/smtp: bad command startup -- throttling Apr 10 07:12:38 cp postfix/smtpd[10278]: warning: hostname [login to view URL] does not resolve to address [login to view URL]: Name or service not known Apr 10 07:12:38 cp postfix/smtpd[10278]: connect from unknown[[login to view URL]] Apr 10 07:12:40 cp postfix/smtpd[18677]: warning: unknown[[login to view URL]]: SASL LOGIN authentication failed: authentication failure Apr 10 07:12:41 cp postfix/smtpd[18677]: disconnect from unknown[[login to view URL]] Apr 10 07:12:45 cp postfix/smtps/smtpd[11847]: connect from unknown[[login to view URL]] Apr 10 07:12:45 cp postfix/smtpd[27778]: warning: unknown[[login to view URL]]: SASL LOGIN authentication failed: authentication failure Apr 10 07:12:46 cp postfix/smtpd[27778]: disconnect from unknown[[login to view URL]] i need to make this mail server secure. i noticed it does not block incoming mail requests. it just denies them. so the log gets big fast. i saw this article: [login to view URL] but did not understand how to resolve it. i need help to solve these two issues. note: only freelancers with experience in this topic will be accepted. Thank you. Kind Regards,