Fedora Users — authentification problem with sendmail and smtp

Dear list
I have a problem with smtp and sendmail. My smtp requires a login and a password. no ssl connection is required. The port is 25.
I have used this configuration below.

divert(-1)dnl

include(`/usr/share/sendmail-

cf/m4/cf.m4')dnl
VERSIONID(`setup for linux')dnl
OSTYPE(`linux')dnl
define(`SMART_HOST',`smtp.gnet.tn')
GENERICS_DOMAIN(localhost.localdomain localhost)dnl
FEATURE(`genericstable')dnl
MASQUERADE_AS(`gnet.tn')dnl
FEATURE(masquerade_envelope)dnl
define(`RELAY_MAILER_ARGS', `TCP $h 25')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 25')
FEATURE(`authinfo',`hash /etc/mail/authinfo')dnl

in /etc/mail/authinfo I have put this line
AuthInfo:smtp.gnet.tn:25 "U:adel.essafi" "P:mypassword" "M:LOGIN PLAIN"

However, when I send an email, I receiv an error message: authentification failed. Could you help please.
Regards
Adel

   ----- The following addresses had permanent fatal errors -----
<adel.safi@xxxxxxx>
    (reason: 553 <adel.essafi@xxxxxxx>: Sender address rejected: not logged in)

   ----- Transcript of session follows -----
... while talking to smtp.gnet.tn.:
>>> DATA
<<< 553 <adel.essafi@xxxxxxx>: Sender address rejected: not logged in
..........................................

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