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

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21
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5answers
163k views

How to correct Postfix' 'Relay Access Denied'?

This morning, in order to correct a problem with a name mismatch in the security certificate, I followed the recommended steps from How to fix mail server SSL?, but now, when attempting to send an ...
3
votes
4answers
5k views

SMTP relay through GMail overrides “from:” address with “[me]@gmail.com”

I've been trying to figure out if this is a new "feature" or if there is an issue with my configuration. I'm using Ubuntu 10.04 Desktop with Postfix as MTA. My smtp (as opposed to smtpd) ...
1
vote
1answer
106 views

Dedicated Server emails ending up in Junk

I have a dedicated server that works fine. Recently I added a new domain with a new dedicated IP address. The emails from the webserver gets sent out from the primary IP address which is different ...
1
vote
3answers
388 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 ...
1
vote
2answers
2k views

Recommended MTA for Windows Server

I need an mail server running on my web server that will just route email through other email servers. Exchange requires Active Directories which just complicates an otherwise simple setup. What are ...
-3
votes
1answer
59 views

How to configure exchange 2010 to be used as an external smtp relay? [closed]

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 ...
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
200 views

SMTP Relay to capture attachments

Does anyone know of FOSS solutions (or general information) on setting up a Linux-bases SMTP mail relay that can do the following: Detect if a message has an attachment if so, save the attachment to ...
3
votes
3answers
3k views

Sendmail relay out of Amazon EC2?

I have a site running on CentOS 5.4 through Amazon EC2. Unfortunately, Amazon has had nothing but trouble with their entire IP range getting black listed from spam tracking services regularly. I need ...
3
votes
1answer
3k 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 ...
2
votes
2answers
7k 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 ...
1
vote
1answer
293 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 ...
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 ...
1
vote
4answers
215 views

SMTP server requirements

Could someone help answer a few questions regarding the networking / DNS requirements for an SMTP server? Assume the server is setup already. Is a MX record required for SMTP? TCP port 25 open to the ...
0
votes
4answers
6k views

Postfix- open relay. How to configure so it is not?

I have setup Postfix but am having trouble with the setup. Whenever I used to send emails to the server, it reject my mails saying 'Relaying Denied', so I changed the following in main.cf: ...
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 ...
0
votes
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 ...