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

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1answer
12 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 ...
-1
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1answer
11 views

How is postfix relay configured by default on OSX?

On OSX, I don't need to configure postfix at all, I just sudo postfix start and it all works. In the log files, I see Apr 23 14:04:46 orcrist.local postfix/smtp[19506]: 9211B2E4B96C: ...
-1
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0answers
34 views

5.1.2 recipient address rejected: user unknown

We are trying to send e-mails from our ASP.NET website (which is on external ISP). We can send internal e-mail addresses but when we try to send external emails like gmail, yahoo getting following ...
-1
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0answers
26 views

apache james mail server load balancing

I have a apache james 2.3.2 server setup in a windows server. Mail server works fine and able to send and receive mails. Also able to see the mails in respective mail directories in that server. Now I ...
0
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1answer
21 views

Postfix on two servers. Can I route all mail though just one of them?

I have at least two web servers which utilise Postfix to send mail from web applications. One is what I call the 'master' which will remain static and the other is what I call the 'slave', which is ...
0
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1answer
17 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 ...
-1
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1answer
38 views

Linux 25 port routing (tunneling/forwarding)

I have: 1) Centos server 1 with postfic/dovecot mail servers IP1 45.45.45.45 (DNS: host1.com.ua) server 1 cannot make outgoing request to 25 port because Internet Service Provider block it! ...
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0answers
26 views

SMTP Postfix server probably used as a spam relay : how to protect? [duplicate]

I'm using my own mail server to send and receive emails : a Debian 6.0.7 running Postfix 2.7.1 and Courier. Today, I'm suspecting that this server is used as a SMTP relay for spammers... The clues are ...
0
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1answer
38 views

smtp relay attack on our mail server (not an open relay server)

Help, We put our Exchange Server (10.0.0.125) behind a SMTP Proxy server (Xeams if you have heard of it), however recently our client complaints we replies their email too late - and we found ...
2
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1answer
64 views

postfix transport relay access denied

When message arrives from other mail server (yahoo/gmail) on my postfix server it gets denied and not being transported using the transport on my configuration. Been checking whole day can't find ...
1
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1answer
19 views

What is the correct way to get an NDR to be sent when a bounce back occurs?

I have a user who developed a WebApp that sends SMTP messages. Users are able to reply to the message using a MUA (outlook, whatever) but there is no NDR if the user doesn't exist. I suspect that ...
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0answers
32 views

Postfix transport relay based on result of MX lookup

You can tell postfix to relay all mails for *@gmail.com via your account on smtp.google.com using transport maps: # /etc/postfix/transport gmail.com smtp:[smtp.gmail.com]:587 . # ...
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0answers
37 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 ...
1
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2answers
34 views

Allow outgoing mail without authentication in MS Exchange

We have a legacy application that needs to send notification email to users using SMTP. It runs on a dedicated server with static IP. It has configuration for SMTP USer and SMTP Server IP, but no ...
2
votes
1answer
36 views

SMTP routing cases: same @domain as sender and different @domain

I would like to know what is the difference between sending an email to the same @domain as the sender and sending to a different domain. I cant really find a detailed explanation on the web. From ...
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0answers
17 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 ...
1
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1answer
41 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 ...
0
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1answer
48 views

Having a local SMTP server to relay emails to my website's mail server

I'm working in a small company. We send our emails through company's mail server which is located (along with company's website) on a shared web host. Once in a while our Internet connection is down ...
0
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1answer
110 views

Capture virtual vagrant server smtp on my actual computer

I'm running a number of virtual servers using vagrant on my computer. This is working well. I have installed Postfix to send SMTP inside these virtual servers. But what I want to do is have Postfix ...
1
vote
1answer
109 views

Dual delivery Google Apps and Postifx (server reject mail from my domain on google)

This is the scenario: I have a server with Postfix and some domains, and now, one of this domains want to use Gmail Google Apps only in a couple of accounts. The end-user configure the domain with ...
3
votes
2answers
81 views

SMTP: Which IP should I monitor?

I use a relay server to deliver external mails. I use relay server's IP in SPF record. But I'm not sure about blacklist monitoring/checking. Should I check main server's IP or relay's IP?
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2answers
449 views

SMTP -> ERROR: RCPT not accepted from server: 554 5.7.1 : Client host rejected: Access denied

I am trying to send mail through phpmailer with smtp.i am using the host which i am using on my outlook with same username and password.I am getting an error .can anyone help me how to fix this. My ...
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1answer
48 views

Outgoing SMTP Blocked

I have an Exchange 2013 Server. My ISP blocks port 25 and it doesn't seem to be working on any other port either. I am currently using DynDNS' hosted SMTP service - but it only lets me send a few ...
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0answers
40 views

Rely Access Denied From Gmail To Postfix

I setup Postfix/Devocot on my server. Every thing is going well. Email is perfectly send from postfix to gmail or other mail servers but when I test the email from gmail to my server gmail through and ...
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0answers
83 views

Postfix is ready for connection but does not send queue

Recently I've had problem with delivering outgoing mails through postfix. I use vps with postfix and dovecot generally as smtp server. It's very important to us emails to deliver email as stable as ...
0
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1answer
94 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
28 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 ...
0
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1answer
377 views

554 5.7.1 <mail_addr>: Relay access denied centos postfix

I have problem in send mail from postfix in centos I have following setup mail server postfix for sending mail but I am getting error. As in the link I tried following commands telnet localhost ...
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0answers
12 views

MailEnable Forgoes Authentication for Local Recipients

I am running MailEnable 2.x on a rather active production server. I blocked any ability to send unauthenticated email through the server, and (in theory) turned off all domain spoofing abilities. ...
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0answers
58 views

Postfix smarthost with diffent relayhosts and sender dependant authentication

I've setup postfix as smarthost with different relayhosts and sender dependant authentication. Everything works ok, but I have a performance question. Is it better to send all the email corresponding ...
0
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1answer
394 views

Postfix with relayhost - relay access denied for bounces

I have set up a Postfix Mailserver, outgoing mail is being sent through a smarthost/relayhost which requires authentification. That works great, internal clients can send to foreign recipients though ...
0
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1answer
43 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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2answers
74 views

Same domain SMTP unauthenticated message relay [closed]

While I was doing some testing on an SMTP server I was able to successfully send mail from knownid@myserver.com to knownid@myserver.com through telnet without any authentication. From a risk ...
0
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2answers
212 views

Can I send email unauthenticated to an internal SMTP server which then relays onto authenticated SMTP?

I have a back-end system which only supports sending email to an *UN*authenticated SMTP server, however, ultimately it needs to go via an authenticated SMTP server on the public internet. My idea was ...
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2answers
939 views

Postfix relay host connection fails: timed out while receiving initial server greeting

I have an Elastix server box that I want to send email notifications of voice mails from. I'd like to send them through our company email (hosted by shared web host provider Bluehost). I have followed ...
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0answers
31 views

Postfix dosen't forward to Gmail Yahoo Hotmail

I have a problem with my Postfix 2.8.4 (Cent OS 6 with Plesk 11.0) If i sent an email to one of these providers, it will be delivered ok. If I setup my email to forward all emails to one of these ...
2
votes
2answers
92 views

MTA handling of too large emails

If an MTA receives an email that exceeds the message size limit, which bevaviour is preferred? What is the default for common mail servers? Reject the email during the SMTP session. The delivering ...
0
votes
1answer
254 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 ...
0
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1answer
98 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 ...
0
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0answers
113 views

Exim Unauthorized Send

I need your help on something. I was going over our eximstats database, in particular the send and smtp tables, when i found something alarming. There a literally hundreds of thousands of entries ...
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0answers
26 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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2answers
214 views

Postfix - unable to access externally

So I can't seem to access smtp from externally. When using a desktop email client (eM client and thunderbird both fail) I can't get it to hit the server at all. (eM client is trying to hit: ...
0
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1answer
60 views

Hook into sendmail

I have an app on a server that sends mail via the local system's 'sendmail'. I want to write a program that takes the payload of the message, modifies it, and then sends it on to the original ...
2
votes
1answer
130 views

What's wrong here? Postfix secondary MX relay with redirection of specific email addresses

The primary mx server for my domain is down, and is likely to be down for a day or so. Meanwhile pressure is on to get sme high priority mail to people who need it. What I want to do is set up a ...
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0answers
51 views

Configure exim4 to send mail from valid user?

I am trying to configure exim4 on a new server. Till now I have been able to make it up and running with TLS enabled and SASL authentication. My update-exim4.conf.conf looks like: ...
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2answers
224 views

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 ...
0
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1answer
141 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 ...
0
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2answers
1k 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 ...
0
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1answer
57 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 ...
2
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0answers
169 views

How to identify the user/computer that is relaying spam through a mail server?

For the past couple of days, at certain intervals, a huge load of email is dumped on my Exchange 2003 server and relayed out until it gets blacklisted everywhere. Nothing like this happened for many ...