Tagged Questions

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

learn more… | top users | synonyms

2
votes
1answer
508 views

Nginx Ubuntu Postfix Config - Can't connect to incoming IMAP server 'server not responding' but can send mail via outgoing using same details?

I'm pretty to new server admin and especially nginx but seem to be getting ok fine apart from accessing my mail via my iPhone? I've changed my domain to 'domain.com' The thing is I can send mail ...
0
votes
1answer
1k views

DKIM on postfix relay server

I have a postfix/amavis relay server, with the domain name mail.example.com. It will be a relay for dozens of VPS's, which will have domains like hostname.example.net. So i have actually two ...
2
votes
1answer
720 views

Exchange 2010 OWA send connector issue

I have problems sending emails outside organization using OWA (Exchange 2010 installed on SBS 2010, domain is domain.local, local DNS). Web-server and email server are hosted remotely, I am using pop ...
1
vote
2answers
210 views

SMTP relay restriction radio buttons disabled

I might just be doing something really dumb, but the two radio button options for my SMTP server relay restrictions are disabled and I have no idea why. I've included a screenshot below to help ...
0
votes
1answer
955 views

configure standard sendmail install to accept outside connections and forward mail to gmail account

I want to have some mail accounts on my domain (contact, webaster) redirected to my gmail account. In order to do this I installed sendmail. Default install (apt-get install sendmail on ubuntu ...
1
vote
1answer
2k views

New mail server can't send emails, only receives

I'm setting up a new mail server for my company with Ubuntu Server 11.04 and postfix/dovecot. I'm new on this so I have some problems. I'm getting it works only for receving mails from any address ...
-1
votes
1answer
370 views

Postfix “Relay access deined” error with Outlook

I am following this tutorial and finished the basic setup. I can login and send via squirrel mail and telnet but receive a "relay access denied" error in the logs when i try and send from Outlook. all ...
1
vote
1answer
266 views

Is there any risk to sending emails to accounts that no longer exist?

As mentioned in a previous question of mine, I send a lot of emails. I have calculated that approximately 2% of them are coming back to me immediately with the general text reading: 550-5.1.1 The ...
0
votes
1answer
1k views

Smtp-Relay in SBS 2011

How to configure outgoing mail in SBS 2011? I am using Thunderbird to open more then one IMAP mailbox, but when I want to send mails it appears that relay is not supported. If I configure one username ...
1
vote
5answers
11k views

How to find out that SMTP server is in open relay?

I used nmap for network security testing. It found that SMTP server was in open relay. Here is the output: nmap --script smtp-open-relay testwww.confidesk.com PORT STATE SERVICE 25/tcp open ...
0
votes
1answer
189 views

Proper configuration for Windows SMTP Virtual Server to only send email from localhost, and tracking down source of spam emails

We manage a server that is hosted on Amazon EC2, which has web applications that need to be able to send outgoing email. Recently we received a notice from Amazon about possible email abuse on that ...
2
votes
2answers
182 views

When is a mail relay needed?

Let me expand... I have a client who is unhappy with their current hosting situation. They want me to move their website and domain across to my hosting platform. I can do this. However I have ...
1
vote
2answers
351 views

Sending mail in localhost:25 with Ssmtp

I already have Ssmtp installed and working in a Centos 5.7 machine with Gmail configured. I can send mails in th shell without problems. Now i want to use the ssmtp to allow a web app (installed in ...
0
votes
1answer
197 views

Is there are postfix setting to disable prepending a sender path in the Received: header?

Currenty emails are sent/received as : Received: from localhost.localdomain (sender.host [xx.xx.xx.xx]) by smtp.host (Postfix) with ESMTP id 7F6CC67897 for <mail@example.com>; Thu, 19 ...
-1
votes
1answer
728 views

Postfix connects to wrong relay?

I am trying to set up postfix on my ubuntu server in order to send emails via my isp's smtp server. I seem to have missed something because the mail.log tells me: Jan 19 11:23:11 mediaserver ...
1
vote
2answers
539 views

SMTP server currently an open relay

I'm using Postfix (2.3.3) on CentOS (5.7). Right now, my server seems to be acting like an open relay. If I specify a login, it works fine, both unsecured and with TLS (however TLS nags me about the ...
1
vote
1answer
356 views

SMTP delivery with multiple recipients

I'm going over some SMTP log files from an open relay server (IIS 6 SMTP Virtual Server), used to collect and route all automated email within a private network, to an internet smarthost (qmail at ...
1
vote
1answer
215 views

Qmail with AUTH CRAM-MD5

My Qmail install on Centos5 has CRAM-MD5 installed. I want to use this to an authenticated SMTP relay. Where do I specify the username and password details for QMail?
0
votes
1answer
396 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 ...
0
votes
1answer
5k views

How to solve authentication error in sendmail relay through gmail [closed]

I followed the steps in http://www.linuxha.com/other/sendmail/gmail.html to setup gmail in send mail. But when I try to send mail I got the authentication failure message. —– Transcript of session ...
2
votes
3answers
3k views

How to get Postfix to send/forward/relay to a sub-domain located on another server?

I have a quick question. How do I setup postfix to send an email to another server (Exchange Server) when sending to an email address that has a sub-domain of our main server. For example, say our ...
2
votes
1answer
7k views

How to set exim4 to send email anywhere but only from authorised users?

Struggling to get my head around the various relaying controls in the exim4 config. I can send email from my server, I can send email from home and work (because I explicitly added suitable netblocks ...
-6
votes
1answer
578 views

What is the proper time delay between sending emails for smtp to not fail on windows server 2008 r2 [closed]

What is the proper time delay between sending emails for SMTP to not fail on Windows Server 2008 R2 machines? For example, if I set a 500ms delay, would it successfully send all emails? My software ...
1
vote
1answer
571 views

Exchange 2007 relay from sendmail, message “Undelivered”. Possible reasons?

Note: This is my re-post from Stackoverflow. I've been messing with a test environment for security purposes where a DMZ RHEL5 sendmail server is used as a relay for an Exchange 2007 server. ...
1
vote
3answers
8k views

How can email be resent that has been delivered to the Badmail folder in IIS?

We have IIS setup as an SMTP relay. A relay security error caused the outbound emails to be delivered to the badmail folder for the IIS SMTP Service. Is there any standard method for attempting to ...
0
votes
3answers
546 views

A flexible SMTP server that's open source or free

We currently have our own in-house email marketing software for our newsletters, and were using SQL server's SMTP agent to send emails through our local SMTP server (IIS) and then onto our ISP's SMTP ...
3
votes
1answer
2k views

Preventing email blasts with Exchange 2010 IP Throttling (or any other technology)

We need to slow down the rate email spam is sent through the Exchange system from our developers' buggy applications. How can I throttle email messages in Exchange 2010 by Source IP, or sender, so ...
0
votes
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 ...
8
votes
1answer
4k views

How can I configure Postfix to ignore relayhost for some domains?

Is there a way in Postfix to ignore the relayhost? I have something like relayhost = [smtp.domain.net]:587 Now for a certain domain I don't want to send it out to that relay but want it to just ...
1
vote
2answers
3k views

Sendmail relay authentication

I'm trying to set up my sendmail to authenticate against a relay (comcast). I'm not seeing any attempts to authenticate at all. I'm trying to just debug how authentication works, and can't connect all ...
1
vote
1answer
760 views

Mailx not sending emails

Using CentOS 5.6 and trying to send (only) emails to remote boxes. I am on a CentOS client box and trying to send email to my road-runner email account. mailx -s "Some Subject" me@tx.rr.com < ...
1
vote
0answers
153 views

IIS 6.0 and Virtual SMTP relay ~ some messages are bouncing

I will give a quick overview and then the details. I have a Exchange 2003 environment that I have been asked to slap on a disclaimer on all outgoing mail. So I have setup a Windows 2003 server and ...
-1
votes
1answer
502 views

550 Relay Denied in Xmail

I am running Xmail server in Windows 2003. When I took SMTP test at MxToolBox.com I am getting an error as 550 Relay Denied. How to fix this error? SMTPrelay.tab file contains the following. ...
1
vote
1answer
1k views

Set up SMTP server to add global signature to all emails from Google Apps for Business

We are using Google Apps for Business for our mail server, but require a global signature (simple HTML) to be appended to every message sent. This is not a feature of Google Apps, although it is ...
0
votes
2answers
844 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, ...
0
votes
2answers
463 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 ...
1
vote
1answer
925 views

detect malicious script used to send mail

i was recently used as an open relay and mass spam was sent through my server. i since then stopped it but my maillogs grow enourmously with this type of log. Aug 20 07:00:29 veepiz ...
1
vote
1answer
516 views

Need help diagnosing “User unknown in virtual alias table”

I'm using virtual alias maps to relay mail and I keep having some of the entries bounce. Postfix seems to know where they are supposed to go and when I run postmap -q for virtual_alias_maps and ...
1
vote
3answers
4k views

exim4 to relay emails

I have exim4 installed on a Linux box. The basics work fine and I can send email from that machine without any problem to whatever email address. I also have a printer/scanner which is capable to ...
0
votes
1answer
168 views

Use sendmail as client for relaying mail

I'm trying to use an account on my central mail server to send all mails from other boxes. My central mailserver is itracknetworks.ca and I have an account there at testuser@itracknetworks.ca. I ...
1
vote
3answers
215 views

Network Hardware supports SMTP, but no AUTH information… Need to Send emails through SMTP with AUTH

I have a network device that supports sending email notifications, but doesn't provide for the username and password. I would like to point this device to an internal system which would then take care ...
0
votes
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 ...
-1
votes
1answer
226 views

Is it safe to make ssmtp SUID root?

I'm using ssmtp, and I would like to not make my /etc/ssmtp/ssmtp.conf world-readable, because it has my gateway password in cleartext. But if it is mode 600, then ssmtp run as an unprivileged user ...
0
votes
1answer
266 views

Relay Access Denied with virtual_alias_maps in postfix

My postfix server is encountering a problem with a couple domains bouncing email. The error message is: postfix/smtpd[2673]: NOQUEUE: reject: RCPT from mail.foo.com[xxx.xxx.xxx.xx]: 554 5.7.1 < ...
0
votes
1answer
1k views

Postfix: 5.7.1 Relay access denied

I hope I can become help here with my problem. I can't send E-Mails. I get only the error message: 5.7.1 Relay access denied my postconf: append_dot_mydomain = no biff = no ...
1
vote
3answers
384 views

Recommended SMTP Relay Service [closed]

I've got a legacy application that needs an smtp server to relay emails. Each client has various control over their IT infrastructures (from little to none at all), so I can't necessarily install an ...
2
votes
2answers
627 views

Has this server been compromised?

A friend is running a VPS (CentOS) His business partner was the sysadmin but has left him high and dry to look after the system. So, I've been asked to help out in fixing an apparent spam problem. ...
0
votes
1answer
369 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 ...
1
vote
1answer
302 views

Setting up SMTP to receive mail

Thanks to a post on StackOverflow, I was keen to discover that I can set up SMTP in IIS6 to receive mail on my Windows 2008 server. However, I'm having a bit of difficulty as my test email results in ...
0
votes
2answers
2k views

gmail smtp over sendmail

I've setup my sendmail to send mail using Google SMPT. However, I keep getting this error. Jun 20 11:35:24 server sendmail[2370]: p5KBZO3X002370: from=apache, size=1646, class=0, nrcpts=1, ...