Questions tagged [smarthost]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
2 answers
34 views

Use smarthost only if VPN is up (Debian, Postfix)

My work laptop is used in a “road warrior” setup. This means it’s often used in whatever WLAN and other networks I find, but I have a VPN connection to the office I can use. The company’s mailserver ...
user avatar
  • 669
1 vote
0 answers
47 views

Exim Smarthost setup works in starttls but not in smtps

I have setup my exim4 as a local mta with smarthost delivery (debian 10 vm) following this guide: Exim on DebianWiki If my smarthost is expecting a ssl connection (smtp over ssl) it does not work. ...
user avatar
-2 votes
1 answer
28 views

Separate eMail relay: DNS requirements beyond PTR record?

Some cloud business offers "always-free" VM instances. Not quite big, but enough for me, so I’m going to migrate my infrastructure there, including mail.example.com. That machine handles ...
user avatar
0 votes
1 answer
212 views

Sendmail not relaying to 127.0.0.1:25 instead of smart host

I am trying to use a SMART_HOST on RHEL7 with sendmail. I have configured sendmail.mc as follows: define(`SMART_HOST', `my.relay.com')dnl After compiling I have this line in sendmail.cf: # "...
user avatar
2 votes
0 answers
122 views

TLS Problems when changing providers relay host

Good Evening, first time posting. This forum and it has helped me many many times. I was looking to for some advice / views on a problem I’m having. The server is relatively old, Debian 6 to be exact ...
user avatar
  • 21
0 votes
1 answer
181 views

Mail queue timing out with sendmail to port 465

I have a working sendmail installation that now needs to send to a different smarthost, on port 465 (instead of 25). I made the following changes to my sendmail.mc define(`SMART_HOST',`mta.mydomain....
user avatar
  • 1,604
0 votes
1 answer
691 views

Exim:Use specific smarthost for certain recipient domain only

I'm looking for solution for the case described below. I've to send mail to some domains (hotmail, outlook) via smarthost, because of blocking my server's IP (Hetzner) on side of Microsoft. Key ...
user avatar
  • 100
1 vote
0 answers
48 views

How to redirect only matching mailboxes to a smart host

I have o365/Exchange configured as an internal relay, so it sends incoming mail for which there is no mailbox onwards to a smart host. The smart host only handles email for addresses prefixed with "...
user avatar
0 votes
0 answers
43 views

Why are out of office mails accepted by receiver when they bypass postfix smart host?

With internal recipients everything works great. Exchange 2010 Out of office mails are sent and received. For external recipients, out of office mails are sent OK but they are not accepted by the ...
user avatar
2 votes
1 answer
725 views

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 ...
user avatar
1 vote
0 answers
58 views

Does Exchange 2013 cache smarthosts?

I am getting desperate and start to question my own sanity so maybe one of your can give an explanation for some seemingly strange Exchange 2013 behaviour. I'm trying to change the url of a smarthost ...
user avatar
3 votes
2 answers
5k views

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 ...
user avatar
0 votes
1 answer
197 views

How to get LAN server to send out via smarthost?

I've got a server on my LAN runnnig exim4 configured to use a smarthost on the WAN like this: disable_ipv6='true' dc_eximconfig_configtype='smarthost' dc_other_hostnames='hostname.mydomain.com' ...
user avatar
0 votes
1 answer
1k views

IIS 6.0 SMTP Virtual Server do not AUTH on Smart Host

We're using IIS 6.0 SMTP Virtual Server to receive and forward e-mails from our website hosted on the same dedicated machine. Everything worked fine, up until we recently transfered the e-mail service ...
user avatar
-1 votes
1 answer
480 views

Exchange Server 2016 Standard: Connect mailbox to external mailbox [closed]

I'm searching for a method to connect exchange mailboxes with external mailboxes. I checked the EAC (found Send and Receive Connectors but they don't seem to be the right answer) and on web (found 3rd ...
user avatar
0 votes
1 answer
2k views

Postfix as a smart host? Is this possible

We have 3 SMTP servers on 3 separate public static ip's. We have a secondary failover connection on a single static ip. I would like to put all 3 SMTP servers behind the router and off the public ip's,...
user avatar
1 vote
1 answer
321 views

postfix smarthost outboud mail server

Greetings good people, I'm really exhausted trying to understand a certain postfix setup by going through its config files. I know this question sounds a little strange to you all as im trying to ...
user avatar
  • 15
0 votes
2 answers
218 views

Exim4: Local delivery after spamcheck of an outgoing email

domain.com and domain.net are hosted on one and the same server server1. To avoid SPAM and viruses all outgoing emails (even to local domains) are subjects to scan with a 3rd party service. Thus ...
user avatar
  • 75
1 vote
1 answer
1k views

Is there any way to relay e-mail without authenticating?

Deployed simple Postfix setup. Currently using Google's SMTP server as smarthost: relayhost = [smtp.gmail.com]:587 smtp_sasl_auth_enable=yes smtp_sasl_security_options=noanonymous smtp_use_tls=yes ...
user avatar
  • 117
0 votes
1 answer
406 views

Exchange route mail to internal smart host

We have a BI/ETL tool which is capable of triggering tasks on receipt of an email. We have a number of servers set up running this tool. Each is configured as an IIS 'smart host'. We currently use a ...
user avatar
8 votes
1 answer
25k views

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 ...
user avatar
  • 395
1 vote
1 answer
175 views

Configuring postfix to use smarthost

I have an application running on centOS 7, which needs to be configured to send mail(postfix) to a third party SMTP server. I have found that a way to accomplish this is to configure a smarthost using ...
user avatar
2 votes
1 answer
88 views

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 ...
user avatar
  • 754
1 vote
2 answers
4k views

Exim client not issuing STARTTLS when connecting to smarthost

I have a Debian8 server running exim4 that sends outgoing mail by smarthost through NameCheap's mail.privateemail.com smtp server - or at least it use to. After a recent update, the server no longer ...
user avatar
1 vote
0 answers
465 views

Force sendmail to check recipient domain exists

There is sendmail relay host for LAN/external users using AUTH or trusting local users, but there is a problem that sendmail accepts mail from trusted users addressed for non existing domains (non ...
user avatar
5 votes
1 answer
2k views

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-...
user avatar
0 votes
1 answer
711 views

exim: different password for remote smtp relay smarthost

Currently I have my exim configuration set to send all e-mails using an external SMTP server. All users authenticate with my exim server with a local password and then the messages sent is relayed ...
user avatar
  • 210
0 votes
0 answers
47 views

Smarthost percentage of mail on Exim4

I'm transitioning mailing of a sizeable number of mails (maybe 1m/day) to another host. I want to warm up the new host gradually over a month rather than suddenly start sending through it and appear ...
user avatar
1 vote
1 answer
2k views

Conditional use of relay(smarthost) for recipient domains matched by header_checks in postfix

On a postfix mailserver, which is configured to generally send mail directly (internet-site), I want to implement a conditional header check for some receipient domains (in this example to keep it ...
user avatar
  • 1,364
1 vote
1 answer
1k views

Exim4 working fine at sending emails, except to addresses with the fully-qualified domain in them

Exim is always touch-and-go for me to configure, since I only touch it once every 4 or 5 years when I have to make email work on a new server. As a result, I'm now having a problem where all the ...
user avatar
  • 1,270
-1 votes
1 answer
577 views

How to check if Exim has copies of outgoing mail

We're using a pretty simple Exim configuration which basically forwards all incoming mail via a Smarthost to a handful of final recipients. Normally this works fine - we don't read any mail on the ...
user avatar
  • 433
1 vote
1 answer
634 views

Postfix - relay locally generated mail but accept mail incoming from GApps for the same domain

I know the way to disable all local delivery is to remove the domain from "mydestination", which will cause all mail to be relayed through whatever relay I setup. But I want postfix to accept all mail ...
user avatar
  • 39
2 votes
1 answer
2k views

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 [...
user avatar
  • 746
0 votes
1 answer
3k views

Postfix: As a smarthost, how can I limit incoming mail to sender domain and sender IP?

I'm running a Postfix+Dovecot service on Centos 7 with a few unrelated virtual domains. This same Postfix server is also set as a smarthost (relay) for IP 192.0.2.2 and 203.0.113.2. Right now, ...
user avatar
  • 363
1 vote
1 answer
248 views

smart host does not deliver email if date header sent?

I use MantisBT 1.2.6 on an Amazon Linux server. It has its own email-sending class layered on top of the PHP mail() function. Actually, it has other options to use smtp or sendmail directly, but I use ...
user avatar
  • 395
4 votes
1 answer
2k views

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 ...
user avatar
1 vote
1 answer
2k views

Exim4: Deny outgoing emails with specific destination domains to being sent to the smarthost

I try to deny outgoing emails with specific destination domains to being sent to the smarthost but unsuccessfully. I'm on a debian "squeeze" configured to use a smarthost. vi /etc/exim4/conf....
user avatar
  • 11
0 votes
1 answer
590 views

On debian, how to set up a MTA like exim that allows per user smarthost configuration?

I have a problem setting up something that I think would be cool. I have a server (Debian Wheezy) and I would like to let my users send email from their smarthosts. From what I have read, exim allow ...
user avatar
  • 451
1 vote
1 answer
153 views

Does sendmail send everything to downstream smarthost in "single file"?

CentOS 5.x / SendMail 8.14.x I have a SendMail server that delivers all outbound mail to a downstream smarthost in the cloud: define(`SMART_HOST',`relay:[example.blah.com]')dnl example.blah.com ...
user avatar
  • 11.4k
0 votes
1 answer
6k views

exim4 - Why is rate limiting outbound mail to a smarthost only working with acl_not_smtp?

In an effort to rate limit outgoing emails per recipient (all emails are sent by the same user), I've been doing some testing in a very simple environment: ...
user avatar
  • 1,552
0 votes
0 answers
120 views

Sendmail smarthost making my big mails sent AND stuck

In order to send my mails from my local Sendmail server to external address, I make it connecting to an authentified SMART HOST provided by my ISP. The sendmail.cf has the following DS line : DS[...
user avatar
  • 183
2 votes
1 answer
3k views

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 ...
user avatar
  • 255
0 votes
1 answer
10k views

Set up Exim to authenticate users and then relay SMTP mail via smarthost using different auth

I am attempting to use Exim to function as an SMTP server which relays mail as a smarthost to our Mandrill service. (The point of this would be using Exim to authenticate our users for IMAP mail and ...
user avatar
1 vote
1 answer
626 views

SMTP as SmartHost for SendMail

My general task is following: We have workable application that sends mails to the users (that are registered in this application on some actions); Mails are sending using sendmail tool; In order to ...
user avatar
  • 123
2 votes
2 answers
12k views

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 ...
user avatar
  • 45
2 votes
1 answer
427 views

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, ...
user avatar
  • 133
0 votes
1 answer
1k views

SPF + ISP Smarthost, always untrusted?

One of the ways mail-servers protect themselves from spam is by SPF-records, a DNS look-up saying what ip-adresses are allowed to send mail from a given domain name. Another way the mail-servers use ...
user avatar
  • 220
0 votes
3 answers
767 views

EXIM - Send local mail to Gateway First

My mail server is protected from spam by our Barracuda appliance. I'm trying to configure EXIM to forward ALL outbound messages to the Barracuda server first, including mail for local domains. Once ...
user avatar
0 votes
1 answer
3k views

exim4 smarthost with sender verification

I'm trying to set up exim4 as a smarthost in front of the ISP mail server. Everything works fine, except from some emails coming from invalid senders (most likely spam). The ISP rejects them with 450 ...
user avatar
  • 531
2 votes
1 answer
2k views

Exim SMTP Smarthost Setup

I used these settings to set up exim to use gmail as a smarthost, which worked. However, I don't seem to be able to use these settings against other smtp servers, such as Yahoo or Fastmail (both with ...
user avatar