I have discovered a strange thing.
I have two accounts at SG.
I have sent an email with this in the "to" field:
io.x.username@neverbox.com, io.x.io_username@neverbox.com
where "username" is another word but is the same.
The email has not arrived and it has not been counted by the SG system (Remaining, Forwarded, Deleted counters don't move).
The same problem also moving the second address in the CC or BCC fields.
The same email but changing the second email domain in spamgourmet.com make the problem disappear.
Thanks for the attention!
Gianni