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Questions tagged [smarthost]

79 questions
25
votes
4 answers

What are SMTP relays and smarthosts?

What exactly is an SMTP relay, and what exactly is an SMTP smarthost? Can someone give me a brief description of each, including how they relate to one another?
LanceBaynes
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10
votes
4 answers

Fastest way to allow sendmail relay through smarthost?

I only want sendmail to relay through my ISP's smtp server, nothing else. How do i set it up?
Carl Hörberg
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8
votes
1 answer

Fixing starttls verify=fail, verifymsg=unable to get local issuer certificate

Running Amazon Linux on EC2 instance with sendmail. I have an email account with Network Solutions, and use that account as a SMART_HOST relay in my sendmail configuration. It works well except for one little detail. In my maillog file I see…
sootsnoot
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6
votes
1 answer

How the Postmaster@domain address works

I'm very new to Exchange (in fact, an apprentice and studying it at the moment) and am wondering how the Postmaster@domain.com address works. An example: A smarthost configured with one mailbox, Postmaster@serverfault.com, with an *@serverfault.com…
PnP
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5
votes
1 answer

How to choose a smarthost based on From: address in exim4 on Debian

I want to route emails with the From: .*@host1.com through smtp.server1.com and emails with the From: .*@host2.com through smtp.server2.com. For the moment, I have smarthost configured with dpkg-reconfigure exim4-config so that…
mikhailian
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4
votes
1 answer

Postfix SASL with Dovecot and Authenticated Smarthost

I have a bit of a problem; I have configured postfix to use dovecot for SMTP AUTH, therefore I had to specify dovecot authentication in the main.cf file. The problem is, I need to also authenticate to my smarthost for outgoing SMTP relaying. I can't…
James Hirst
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3
votes
2 answers

Exim Smarthost Multiple domains and credentials Mailgun

I have a GCP instance running with whm/cpanel and mailgun setup using exim for multiple accounts using multiple domains. The current setup works for all domains however it only validates for the main domain. Mailgun supports multiple domains with…
user2059376
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3
votes
2 answers

Authenticating to Exchange 2010 smarthost?

I have a postfix mail server that should relay all outgoing mail to an Exchange 2010 server (the Exchange box is my smarthost). I have administrator access to the Exchange 2010 system, but I'm not very familiar with it. How should I set up…
Richard Hansen
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3
votes
1 answer

Postfix - Send only rejected mail through smarthost

I'm trying to improve the mail delivery for an organisation I work with (no spam). We have been using our normal mail service's smtp server as a smarthost for delivery, but recently they have blocked the account because it was sending too much…
Jords
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2
votes
1 answer

Forged FROM: header despite reject_authenticated_sender_login_mismatch

structural description Server A runs postfix and acts as smarthost for server B (also running postfix), reject_authenticated_sender_login_mismatch is set and works (almost) as expected, see below Client C's MUA sends mails via Server A B and C both…
herrhannes
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2
votes
1 answer

Turning off EOP connector during maintenance

I have a virtual mail server in house protected by Exchange Online Protection, and it has been running well for the last few months. Over the weekend, the hosts that host the VM will be taken down, as will most of the network, for a rewire and other…
TiernanO
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2
votes
1 answer

Postfix smarthost, allow relay by dynamic IP

I have several servers (web, mysql, java) that have postfix installed which are set up to relay to a smarthost postfix server. DYNAMIC IP STATIC IP INTERNET [PHP -> sendmail -> 25:postfix:2525] ->…
Christian
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2
votes
1 answer

Plain-text login with sendmail and SASL, Ubuntu 10.04

I'm trying to configure sendmail with a smarthost. I mostly followed this guide (although I understand it is written for Scalix). SMTP server uses plain-text authentication. However, when sendmail tries to relay an email, I see this error in…
torvin
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2
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2 answers

Sendmail: Mails are still being relayed to root@localhost

I am running CENTOS 6.2 with 2 virtual machines one 'auth'(192.168.0.2) and another proxy (192.168.0.3). Proxy host has no internet connection. My intention is proxy host will send its mail to auth host and auth host send the mail out from there.…
Qumar
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2
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1 answer

Postfix, MSA, Smarthost, and LAN

I've, let's say, 5 servers. They are either public and private or only private (network), they all send e-mails, either system e-mails (local mailbox) or installed application (wiki, issues tracker, etc.). And I've a 6th which I want to use as…
Trent
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