disappearing emails, stunnel, NO LOGS

I have a domain at godaddy that is used only to forward emails.  Allows me to create instant email accounts!

When the godaddy hosted domain forwarded to a gmail account, using stunnel, blat, and  smtp.gmail.com, the emails just go into a black hole.

When I set the godaddy domain to forward to my isp email account, still using same stunnel conf, same  blat profile, same blat -server, (  smtp.gmail.com)  the email is delivered.  

SO gmail seems to have some spam filtering or relay filters.  I am mainly interested in figuring out how to find a log of this, because stunnel log seems to be identical!  No warnings that the mail isn't delivered.

stunnel  log
2015.01.22 07:54:49 LOG5[816:7100]: Service [gmail] accepted connection from 127.0.0.1:62665
2015.01.22 07:54:49 LOG5[816:7100]: connect_blocking: connected 74.125.70.109:465
2015.01.22 07:54:49 LOG5[816:7100]: Service [gmail] connected remote server from 10.0.0.11:62666
2015.01.22 07:54:51 LOG5[816:7100]: Connection closed: 545 byte(s) sent to SSL, 515 byte(s) sent to socket

Blat debug info is the same in both cases.

Very weird, not really a blat issue, except for the lack of feedback that the email was not delivered.

I've also noticed some domains now block email forwarding when the forwarded email contains a distribution list. Editing the forwarded email by removing the distribution list from BODY solves the problem.  Note that the forwarding is to a single recipient!