Mails are not getting delivered

[Error: DEPTH_ZERO_SELF_SIGNED_CERT] while using Email.send() and mailcomposer of nodemailer package in meteor blaze for mailing

and when I use process.env.NODE_TLS_REJECT_UNAUTHORIZED = “0” then error does not occour and on console “message sent” display but still mail not received.

Any idea what is causing this issue? We are using Meteor 1.2.