I'm using web to lead and then sending an auto responder to the lead.

When testing, these auto responder, emails are getting sent straight to my gmail junk mail. They have the following message on them:

Be careful with this message. It appears to have been forged and did not originate from your account.

Is there a way to send these emails through my smtp server, or to otherwise stop this? It's not worth sending the emails if they just go to junk.

Thanks

James