Hi, i have a private server which handles email messages for different domains - ie, example.com, mydomain.es - through Postfix. For domain mydomain.es i'm already using Google Apps to handle the email. I use both systems to handle the email for domain mydomain.es because i have some web apps installed on the server which needs to send email messages on behalf mydomain.es and as i already i had a Postfix mail server working i decided to set it up on my MTA system.
The issue i'm looking to solve is related to Google Mail forwarding system. Some days ago i enabled automatic email forwarding for f...@mydomain.es so ti forwards email to b...@example.com but when it gets Postfix on the server i gets rejected due to the following message: postfix/smtpd[5945]: NOQUEUE: reject: RCPT from mail-ot0-x22d.google.com[2607:f8b0:4003:c0f::22d]: 550 5.1.0 *<foo+caf_=bar=example....@mydomain.es <example....@mydomain.es>>*: Sender address rejected: User unknown; from=<pau+caf_=dmarc= tobycoach....@pauperis.com> to=<dm...@tobycoach.com> proto=ESMTP helo=< mail-ot0-x22d.google.com> I don't know why Google does this rewriting but i would like to know what could i do in order to solve this issue. These are the original headers: Delivered-To: foo+caf_=bar=example....@mydomain.es Received: by 10.157.7.81 with SMTP id 75csp4162688ote; Wed, 29 Nov 2017 02:36:22 -0800 (PST) X-Received: by 10.157.92.197 with SMTP id r5mr1920889oti.286.1511951782640; Wed, 29 Nov 2017 02:36:22 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1511951782; cv=none; d=google.com; s=arc-20160816; b=iRH6MZeu7Cm7aUGgPwgqJd+e5T4ijzeY/1IyUha8x/Aj9GSkx8jU/x3Ym6GRR526Zk TP+JN3MY6tp38C7tubTUJPa3xRoeUCEt09g44egcjVfMHbTST0AZG86TvqNXzLSVC+0P oTOh3ab1COe1GA2DLeaB24QtO3llLYiFZ83OViBMDGVaDr9Vlhp61HZoanND6oziruMb QPrPGcejFEgX8oryU8nA6jUrkSHVXFQpwaPok+tNRk4SQuMMAvAX5umF2qO6i6MiDkOa 634L4nh/24a1+4FP/+sP/mbyjEk3X51gsoXGLmuv9SK/lXSmkvFERd1+n3Oh2cRlUMOK DDfw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=date:message-id:in-reply-to:references:subject:auto-submitted:to :from:dkim-signature:arc-authentication-results; bh=XLvWlJgtropuAWVgL4T11D77Kxt40EfUM+DfSKy1y90=; b=l+WZtBnktn4eI0hTjbom0Oa7tbsyfF8QkIX5TWB7AjuUHnIlG2rzBL88wkrtnOVPpe BSmFQvRgXnxlZpsXOg4uzzyaMX8mk2Xw6Nih78oH10OFrZqrkr3ymX9dknWnXCv6KVM+ cqBc+MzdUsxw8gvVnOFnarO6rWM4kv+JAuabF6MQwvvHlRKOLrb9Wi4kE+t8UzU+kee2 V+0Gfs6Kzf4dl37tNwQhgcTHN5xcTalrQ6eDN8IpiPwV//o8jX8Jwqc8p7LTL7bjH8d6 VtMFVZkZGutZndsJl4Yw6QmiO/YUsQaV3AfuzLsxkEHlYUPB1W8GZbuIMQb/u5msimTW hNEw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@googlemail.com header.s=20161025 header.b=tcyPoStR; spf=pass (google.com: best guess record for domain of postmas...@mail-sor-f69.google.com designates 209.85.220.69 as permitted sender) smtp.helo=mail-sor-f69.google.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from= googlemail.com Return-Path: <> Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id i17sor505691otc.135.2017.11.29.02.36.22 for <foo+caf_=bar=example....@mydomain.es> (Google Transport Security); Wed, 29 Nov 2017 02:36:22 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of postmas...@mail-sor-f69.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; dkim=pass header.i=@googlemail.com header.s=20161025 header.b=tcyPoStR; spf=pass (google.com: best guess record for domain of postmas...@mail-sor-f69.google.com designates 209.85.220.69 as permitted sender) smtp.helo=mail-sor-f69.google.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from= googlemail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20161025; h=from:to:auto-submitted:subject:references:in-reply-to:message-id :date; bh=XLvWlJgtropuAWVgL4T11D77Kxt40EfUM+DfSKy1y90=; b=tcyPoStRP7CyZ8hS+BqK8TN2R+MJGyzb+BcRwA6sWe16O0lVth0vHROn8RHQGmLVQF fDTy2mRT1WGTMXFrzv7mEq4iJDsNo/JG0rtmYZm2KlhKrKFLmVVJyGm4MFskHSVz4JGY fP3Jlc33HZ5JKAsBINmgwAjMsxo4VJxKWRqBpprl+jK/78n8gD14u8WUW82MwoIdcXZY NQhUxnjHzp73r4KalOqSbQTxhHKoRbAWJkG39e7685ewOGagYAXBn1yNE/LW1QLqC8AP A3CtsC42OM+HariU25Nh5djY9kNjResOUxHfZ4hyoMBvWplIBaN5Ak1UE8tc6kTiVzUJ l9NQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:auto-submitted:subject:references :in-reply-to:message-id:date; bh=XLvWlJgtropuAWVgL4T11D77Kxt40EfUM+DfSKy1y90=; b=PGtpO1Yy75ok/k39/aaNrfJm5Aq8roycBntbnnE/WlrVSPoKgo0NhN7cqBjzeU2Ke7 60yneA4HWVwyrHl1y+Tpgg7d98ZC51g1wcwjiTgOyi6YkAInwrI1540HGPNPzQrL1ddG pJ5/Hx21mcpHEcGUerWYDqPa2HOtm0WKjlxe+fn68QbGTdzMDlnEhu8zN7j6a7ub2Xmw vHqOwHYuhVL4FhUOb/ONZx6L8b96IlvURiwpIDWi69ybtx7oXEBtaABXzeDIpU4zKzhf 90qybECA/NsuqgdLqTGiRpmKAZ18N0sjknUQ9iVm0hNHtGiuKQOcTTkhck0WeuO2cj1r JA2w== X-Gm-Message-State: AJaThX4b2lenay3D0PrrlDomryFfWa9ySXcnG62iKWyDkQVQVJ430hjx Y8rjha0cPPez3qHvd24KZGegCf3gASODO4QCnpIMVw== X-Google-Smtp-Source: AGs4zMb/6o/h1hSBtPS+Igrtd+pa5pekIhxmNQC9b02vzMz6BLvppxdIXQ3RFCC+imq2/ZrQ3YDPPITqOdOfXyKxUxb2XSj/Ar2dFtw= X-Received: by 10.157.15.154 with SMTP id d26mr1695860otd.334.1511951782499; Wed, 29 Nov 2017 02:36:22 -0800 (PST) Content-Type: multipart/report; boundary="001a113cf206e9cb46055f1cb476"; report-type=delivery-status Return-Path: <> Received: by 10.157.15.154 with SMTP id d26mr1786241otd.334; Wed, 29 Nov 2017 02:36:22 -0800 (PST) From: Mail Delivery Subsystem <mailer-dae...@googlemail.com> To: foo+caf_=bar=example....@mydomain.es Auto-Submitted: auto-replied Subject: Delivery Status Notification (Failure) References: <13791490251038316...@google.com> In-Reply-To: <13791490251038316...@google.com> X-Failed-Recipients: dm...@example.com Message-ID: <5a1e8da6.9a0f9d0a.d4644.1dfc.gm...@mx.google.com> Date: Wed, 29 Nov 2017 02:36:22 -0800 (PST) Thanks for your time :)