From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 0F1CF138206 for ; Fri, 19 Jan 2018 18:52:00 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id B59DEE097E; Fri, 19 Jan 2018 18:51:53 +0000 (UTC) Received: from tncsrv06.tnetconsulting.net (tncsrv06.tnetconsulting.net [IPv6:2600:3c00::f03c:91ff:fe26:8849]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 42FD4E0955 for ; Fri, 19 Jan 2018 18:51:52 +0000 (UTC) Received: from REDACTED ([IPv6:2620:0:102a:11:29cd:bb8f:2a8f:6c70]) (authenticated bits=0) by tncsrv06.tnetconsulting.net (8.15.2/8.15.2/Debian-3) with ESMTPSA id w0JIppWa004452 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Fri, 19 Jan 2018 12:51:52 -0600 ARC-Filter: OpenARC Filter v0.1.0 tncsrv06.tnetconsulting.net w0JIppWa004452 Authentication-Results: tncsrv06.tnetconsulting.net; arc=none header.d=tnetconsulting.net ARC-Seal: i=1; a=rsa-sha256; d=tnetconsulting.net; s=2015; t=1516387912; cv=none; b=A1awax49sqxx/7vv3VPbuXPXldBKEvfil5lc22u9noFndmTa9yTut9H4gfHV41Zky4rAbvx4iUZhcSpVG4drwBvz/o4hQN23rwrfchiXrtcGtogEUNENp6nLuX3QjabiCZzhmK00capp/DWvL6Sz498R89twgg0w+OKT7yvaKTo= ARC-Message-Signature: i=1; a=rsa-sha256; d=tnetconsulting.net; s=2015; t=1516387912; c=relaxed/simple; bh=4UnyIeO4YsxLBlLgqfFO4X0s8QDeD4DfZs1pvOYYwKU=; h=DKIM-Signature:Subject:To:From:Message-ID:Date:User-Agent: MIME-Version:Content-Type; b=wdagALNrykRAaLdB0AUfkqvH3s/GFS458Jd16mFQu8SaMIQ6YJeJcW/IBb8IwniOaQzeZtHcZY3NU4fMpnCkREnt//CNPK/UX7ry/vOj2DTzoOHEsCM6NHSnuzivCUpycOm83n3IDkQ+ZFuBqk4OWskq9tmexJKOVqF2wtNo9fk= ARC-Authentication-Results: i=1; tncsrv06.tnetconsulting.net; none DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=tnetconsulting.net; s=2015; t=1516387912; bh=4UnyIeO4YsxLBlLgqfFO4X0s8QDeD4DfZs1pvOYYwKU=; h=Subject:To:References:From:Message-ID:Date:User-Agent: MIME-Version:In-Reply-To:Content-Type:Cc:Content-Disposition: Content-Language:Content-Transfer-Encoding:Content-Type:Date:From: In-Reply-To:Message-ID:MIME-Version:References:Reply-To: Resent-Date:Resent-From:Resent-To:Resent-Cc:Sender:Subject:To: User-Agent; b=z7+Y5AZRLwumkUfCg+OTzg2EuAtrXfwu8+FxHaybBUYZJwsTe3oF9UkLbNb97/St7 s5yrNfJ+ZsxAYcejF3TZjn6eflBUz+CAsNq8RwrJq2KN1F41qZHDW28Fs2IH1MrNgI j2PFHmDrjMt1ERZQB3oa80irwP8EQkO9/dBLGdVA= Subject: Re: [gentoo-user] Re: Simple SMTP to cmd-line MTA relay? To: gentoo-user@lists.gentoo.org References: From: Grant Taylor Organization: TNet Consulting Message-ID: Date: Fri, 19 Jan 2018 11:51:50 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms040706010309010002090703" X-Archives-Salt: 0e34f5bd-db48-4133-84ce-eba32631c95a X-Archives-Hash: 5b33959cb7b6d86b6a046f1d69ec2a4e This is a cryptographically signed message in MIME format. --------------ms040706010309010002090703 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 01/19/2018 11:31 AM, Grant Edwards wrote: > I want to accept incoming email via SMTP (my computer is an SMTP server= ). Okay. So you don't need to accept mail via /usr/sbin/sendmail (et al). Or rather, that's what you want email to leave the relay through. > I want to relay each of those messages by invoking a command-line utili= ty=20 > that has the same "API" as /usr/bin/sendmail. That utility injects the= =20 > mail into another machine's MTA. Okay. Aside: I don't know that I would consider that to be an API, but I do=20 see why you consider it as such. > In this case, the /usr/bin/sendmail utility transfers the message to a = > different machine's MTA using mechanisms that are beyond the scope of=20 > my question. Okay. > There is no local delivery. It is a relay that accepts mail via SMTP a= nd=20 > transfers it to a different MTA. The usual way to do this is to accept= =20 > mail as an SMTP server and then relay it to the next MTA by acting as=20 > an SMTP client (e.g. via postfix's 'relayhost' setting). >=20 > Instead of transfering mail to the next MTA by acting as an SMTP client= ,=20 > I want to transfer it by invoking a command-line utility like sendmail = > or msmtp. So it sounds to me like you want a gateway of sorts that speaks SMTP (as = a server to clients) on one side and (that = acts as a client to other servers) on the other side. Is that accurate? In Sendmail parlance, what you want is a custom mailer. Said custom=20 mailer would then interface with your custom /usr/bin/sendmail=20 (emulation wrapper). Finally, configure Sendmail to use said custom mailer as the method to=20 communicate with the smart host. --=20 Grant. . . . unix || die --------------ms040706010309010002090703 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC CxcwggUpMIIEEaADAgECAhAIzwdZriPvq7FXSbc0jGReMA0GCSqGSIb3DQEBCwUAMIGXMQsw CQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxm b3JkMRowGAYDVQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBD bGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzExMTcwMDAw MDBaFw0xODExMTcyMzU5NTlaMCsxKTAnBgkqhkiG9w0BCQEWGmd0YXlsb3JAdG5ldGNvbnN1 bHRpbmcubmV0MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvhfMhFM6CDAWL4Mg xrKLLbzTCILpI7uBzgG/HFXxV92MX4fba+pAotqOV8of7uF4YykVw94lCsOmFeVkb8VNSn6Q 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