UNABLE_TO_GET_ISSUER_CERT_LOCALLY

[cawoodm]

Nodemailer 1.3.0 (with node 4.2.6, Win7 64bit) is failing to send mails with:

[Error: unable to get local issuer certificate] code: 'UNABLE_TO_GET_ISSUER_CERT_LOCALLY'

SMTP is otherwise working fine and does not require SSL.

We do have a system web proxy and I have tried configuring that ( proxy: 'http://localhost:8888/',) to no betterment.

SSL seems OK:

C:\>openssl s_client -connect smtp.live.com:587 -starttls smtp
connect: No error
connect:errno=0

Configuration:

{
  pool: true,
  host: 'smtp.mydomain.com',
  port: 25,
  secure: false
}