Please suggest how to send mail using my gamil smtp server in wix
Have a read of previous forum posts like here.
https://www.wix.com/corvid/forum/community-discussion/send-email-from-code-via-gmail-smtp
Connect Gmail MX Records to Wix . How to fix email settings on Wix
Otherwise, you can look at connecting it through Wix as shown here.
https://support.wix.com/en/article/connecting-your-gmail-account-to-wix-inbox
https://support.wix.com/en/article/connecting-your-g-suite-mailbox-to-a-mail-client-using-imap