can not receive the email from my website

After server migration, I end up into email configuration error. I am unable to receive any email from the website. My service provider suggest these:

It seems that your scripts are using smtp without authentication due to which these emails are not going through from the server. Email scripts need to use authentication while sending as per the newer servers.I would suggest you to change the scripts from your end to mail with authentication and smtp with authentication and try sending the emails which should then work fine.

Can anyone please help me to resolve this on ELGG 1.8  email configuration error.