The mailing list for listmasters using Sympa

[address@concealed]

Hi everybody,
It's a strange thing, and I want know if someone has detected this.
I have a user that is admin of a list. This user have a gmail adress and if he
send a mail to the list, the message is recived to all the subscribers but 
this
user don't recibe the message. The first thing that I thinked was that I don't
activate the reception mode, but it is active. The next thing, I try to do the
same action with another admin  with no gmail, and this admin recived the
message.
I take a look to the log in sendmail and I saw that email adrress is in the
process of sending.
It's for this reason that I think gmail detects the author of the mail is the
same of the author of the mail to the mailinglist, and the message id is the
same.

Is my thinking wrong?

thks to all.
PD: excuseme for my bad english.