Simple Mail Transfer Protocol (SMTP) relaying (transferring between computers).

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Exchange 2013 Internal Relay via Smart Host

Thank you for your help in advance! I am currently setting up an Exchange 2013 server, to replace our old POP3/SMTP system, however we would like to roll this out gradually when convenient for our ...
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1answer
192 views

How to use sendmail to send mail as local user from remote computer and protect with password

I have a sendmail server running that currently only accept to send mail coming from localhost. Everything going out is masqueraded as @mywebsite.com and there is DKIM SPF MX and A record bound to the ...
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2answers
4k views

How to configure postfix on Ubuntu to relay emails through Office 365 (SMTP) with TLS

I'm attempting to setup a postfix relay to our new Office365 setup for some internal devices on our network that require this specific setup. I've been trying various sites with configs and ...
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1answer
60 views

What postfix does if it is unable to deliver a message?

If I send a message from postfixA -> smartHost postfixB -> smartHost postfixC -> exchange and only postfixC does MX lookup and it is unable to deliver the message no matter if it is a hard ...
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1answer
48 views

Will Email sent from a 3rd Party SMTP service get classified spam?

I have a web application that I developed. I was originally using the Google Apps smtp servers for the outbound emails generated from the application for user notifications. As use increased Google ...
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1answer
292 views

postfix relayhost 'Recipient is not recognized. Relay access denied'

im trying to get webmin postfix to send emails through my smtp account with another email provider (in this case lavabit.com) im getting the error 'Recipient is not recognized. Relay access ...
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1answer
1k views

exim is not accepting external connections

Update: It's definitely my ISP blocking port 25. I told Exim to listen on a non-standard port, and then checked from a remote computer to that port, and it went through just fine. So, I guess I have ...
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1answer
702 views

Postfix: Relay access denied through SASL with permit_sasl_authenticated setted

Postfix 2.7 / Ubuntu 10.04 LTS when i try to send a mail from Outlook (with smtp auth) to a gmail account (or others), i get relay access denied. The log (i've faked the emails): Feb 24 16:49:16 ...
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1answer
368 views

How to have Postfix send email to another server if user lookup fails for specific domains

Currently my server acts as a gateway, checks AD for valid email addresses, if the email address exists in exchange it sends over the email, otherwise just rejects (typical) I need Postfix to send ...
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2answers
1k views

Setting up SMTP server (Windows 2008 R2) to use with Microsoft Data Protection Manager

DPM is installed on one of our servers - namely Datacenter. Essentially, there is no Exchange server in the domain, so we wanted to setup our own SMTP, and use a gMail account to forward ...
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1answer
225 views

exim greylisting non-auth SMTP mail?

I have smtp auth set up on my exim4 Dqueeze server so that only auth'ed clients can use it as a mail relay. I believe this is working, e.g. thunderbird (w/out password) reports that I am "not yet ...
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1answer
436 views

relay mail from one postfix server to another

I'm attempting to use just 1 postfix instance to input ALL my outgoing mail. From there the goal is to relay it to my one of the many outbound postfix instances. I do this using round robin dns so it ...
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4answers
4k views

Google Apps as SMTP relay?

We have linked the domain of our company to Google Apps and we also have a Kerio Connect (mail server) installed in our company which uses Google as SMTP relay. As google requires SMTP authentication ...
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2answers
884 views

DNS, SMTP Problem. Trying to send emails through PHP scripts using Gmail server

I have purchased a dedicated server some days ago and I think I don't have enough knowledge to configure its DNS etc. Well, I'll describe my situation. I have a dedicated server for virtualization, ...
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2answers
490 views

How to send email from non-TLS enabled client through TLS-only Gmail account

I need to be able to send email from a client (an OKI document scanner) which is non-TLS capable. But my company's email service is provided by Gmail-Google Apps, which is configured to force TLS ...
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3answers
4k views

Mail not relaying in postfix

I am managing a server which mainly deals in relaying mail using virtual alias maps. For some reason unknown to me email that goes through these maps are getting bounced. I've checked to make sure the ...
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1answer
388 views

Protecting server from smtp auth relay attack

Server configuration OS Centos 5.xx SMTP exim / dovecot I would like to know how to protect my server from smtp relay attacks. Currently my server is experiencing smtp relay attack because of ...
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1answer
580 views

Postfix rewrite header issue

I currently relay all my cPanel (exim) outbound emails through my Postfix server. However, postfix seems to remove some important part in the header that exim added before sending to relay. As ...
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1answer
177 views

postfix SMTPD relay problems while sending

Hello My server is Ubuntu LTS 10.04 Installed and configured postfix with sasl, courier and virtual domains with mysql behind them. everything is working except for sending of email to outside ...
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3answers
2k views

How do I secure smtp in exchange?

We currently run windows server 2003 with exchange mail, but have been blocked with spamhaus.org even though we don't send out spam mail. My question is, what settings do I need to set with smtp to ...
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1answer
451 views

Configure mail server to relay through another mail server

I'm a developer and I'm currently building a hosted ecommerce solution. One thing the software must do is email customers on behalf of the vendor. However, one of the business requirements is that ...
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1answer
71 views

Email Proxy Loop

I have an exchange server 2003 running in Windows 2003. I have an unnamed program that listened for incoming mail, signs it with DKIM and then should relay it back to the Exchange server. I am a ...
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1answer
318 views

mail server administration

MY postfix does not show that it is listening to the smtp daemon getting mesaage below: The message WAS NOT relayed Reporting-MTA: dns; mail.mak.ac.ug Received-From-MTA: smtp; mail.mak.ac.ug ...
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1answer
367 views

Server and Application architecture for large outgoing email volume

we need to develop an application to send large amount of emails (newsletters) We estimate 15 millions of emails per month (6 - 10 emails per seconds). Would you recommend me the proper architecture ...
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1answer
1k views

How to set up my own computer to be an smtp relay only on my private network?

we have mac os x server which isn't connected to the internet, but it's hosting some collaborative tools which is used internaly only (lan). Some of those tools send notifications, but our mail ...
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2answers
448 views

Drop mail to same domain via different relay

OK, this is a slightly convoluted question. I have a machine here that collects all our mail from an upstream provider with fetchmail, and stores it in our office for collection via IMAP4. We also ...
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3answers
6k views

sendmail relay status

I have a RHEL3 server with sendmail configured to relay mail to: # "Smart" relay host (may be null) DSmailrelay This relay server is an exchange server not administered by me. A few days ago its IP ...
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3answers
526 views

Exchange 2003: Outbound messages delivered locally

I'm trying to setup Exchnage 2003 in our test domain to send outbound messages. I would send an email to a gmail address, for example, but in the Message Tracking Center's message history for this ...
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1answer
15 views

Exchange 2013 SMTP reply error not being sent

We are scanning to our exchange 2013 server from a scanning application that uses smtp, in the past when the mail exceeded the smtp size limit it would send an email with a link instead of the scanned ...
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1answer
15 views

How does zimbra procedes with sending email to the same domain if zimbra is configured to relay the messages to a proxy server

Does zimbra relay emails that are from the same domain as the expeditor or the emails are send directly to the zimbra mailbox without going trougth the relay server? I have a mail p1@domain.com and i ...
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0answers
27 views

Local Xeams standalone server not sending emails?

I want to setup a Ruby On Rails development environment where I can develop an application that can send emails. I can use the smtp.gmail.com free server but I do not want to use it, but rather I want ...
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0answers
23 views

Windows server | HmailServe | Relay

My setup: I am using PHPMailer (smtp) to send out emails via my websites. I am using a windows 2012 server as my mail server which is using Hmailserver. I am using Mailgun to relay my emails. Things ...
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1answer
28 views

How to make exim4 on Debian safe?

I am running exim4 on a vanilla Debian Stable system. The machine has proper DNS A and MX records. I want to use it as a mail server. SMTP with TLS already works fine for authenticated users. ...
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0answers
124 views

Use nginx as reverse proxy for outgoing mail

We have a production server running a singlepage web-app and a separate proxy server, for security reasons. Every request to our web-app is handled by our reverse proxy (nginx) on the proxy server. So ...
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1answer
29 views

Postfix acts as sender for unathenticated connections on port 25 for $relay_domains

My postfix can be set as SMTP server on any email client, on port 25, no auth, to successfully deliver e-mail to any domain listed in $relay_domains. This is bad, and can be easily used to send spam ...
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1answer
37 views

Exchange server relay [duplicate]

I'm currently trying to configure our exchange 2010 to be used as a external smtp relay. What I'm trying to do is allow certain websites that we manage to send email using our exchange server smtp ...
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0answers
224 views

How to exempt localhost from SMTP smart relay?

I've got a mail server (mail.mydomain.com) that has a relay set up as such: /etc/postfix/main.cf: # Smarthost relayhost = [smtpcorp.com]:2525 smtp_sasl_password_maps = ...
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0answers
95 views

IIS 6.0 SMTP Relay mail to other mail server through SSL port 465

May i know iis smtp relay can/can't support to mail server (Zimbra) through SSL (Port 465). i just can see the check box of TLS encryption, pls help, thanks a lot. SMTP Relay Version Internet ...
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0answers
102 views

Forwarding email through a dummy relay to avoid blacklisting

I have a mail server that allows individual users to forward mail to other providers. The server performs the usual anti-spam checks, but spam still gets through occasionally -- especially with the ...
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1answer
2k 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 ...
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1answer
332 views

Using IIS smtp for incoming and outgoing and use hMailserver for mail accounts

I have installed hMailServer in one machine and IIS STMP in another machine. Even though hMailSever itself is a SMTP server. I can't avoid this because the IIS SMTP server has some hooks which which ...
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0answers
190 views

Handing E-mail Bounce Back in IIS, Setting up SMTP

Our servers send e-mails from @example.com to customers, clients, etc. We use Google Apps for our domain to send and receive additional e-mails from @example.com. Now, we're trying to handle e-mails ...
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0answers
44 views

Issue with Russian Characters using IIS6 SMTP Relay

We have an issue where we have an issue with Russian Characters in the body of emails when using IIS6 SMTP Relay on Windows Server 2008 R2. The relay points to an email provider. The characters ...
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1answer
396 views

Postfix: mail delivered locally, but I wanted relayhost delivery

I work at example.net :-) and my team's server is named tardis.example.net . Any mail sent to us must first go through our company's internal relay hosts. Although the messages are delivered to our ...
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0answers
33 views

Mail server in the middle responsible for translating from one domain to another

The title is a little confusing. We have an internal mail server that can be used to send mail. This internal mail server is only accessible from within our firewall unless we use the mail server's ...
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1answer
69 views

Configure IIS SMTP server to forward to more than one address

I have the SMTP service installed on Server 2008 R2. Under Domains, if I go to properties, under Route Domain, I have the option to forward all mail to smart host and I currently have one address ...
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1answer
159 views

Postfix: don't bounce for remote rejects

I'm having a problem with sending bounces to spammers when a remote "trusted" smtp server rejects a mail. My server manages mail for company1.com that has a virtual alias support@company1.com that ...
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0answers
42 views

List the bounce back email ids - .net

I'm sending a mail to bunch of email IDs. Once the emails are sent, I need to display the notification - saying how many successful mails were sent and how many to which mail IDs the email was bounced ...
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0answers
123 views

SMTP relay anti-relaying and LIMIT/QUOTA

I need some help to face this problem. I have 2 LAN connected to the same router. My first LAN is the office LAN and left on the internet with one public IP address. My second LAN is the datacenter ...
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1answer
172 views

How does domain name resolution work for SMTP relay services?

Having problems with the default e-mail provided by a shared host (blacklisting and quotas), so I'm looking into SMTP services to handle outbound mail instead. However, one thing that I haven't been ...