There was an error sending your message: Failed to add recipient: roger@gmail.com [SMTP: Invalid response code received from server (code: 550, response: 5.7.1 <roger@gmail.com>... Relaying denied)]

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Dec 20 10:30:38 polsmtp imapd[31340]: imap service init from xx.xxx.xx.31
Dec 20 10:30:38 polsmtp imapd[31340]: Authenticated user=guiltyx host=toto.fr [xx.xxx.xx.31]
Dec 20 10:30:43 polsmtp sendmail[31341]: jBK9Uh07031341: ruleset=check_rcpt, arg1=<roger@gmail.com>, relay=toto.fr [xx.xx.Xx.31], reject=550 5.7.1 <roger@gmail.com>... Relaying denied
Dec 20 10:30:43 polsmtp sendmail[31341]: jBK9Uh07031341: from=<guiltyx@yo.fr>, size=0, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=toto.fr [xx.xx.Xx.31]
Dec 20 10:30:43 polsmtp imapd[31340]: Logout user=guiltyx host=toto.fr [xx.xx.Xx.31]