SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.

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Monitoring services for email servers

Does anyone have experience of hosted services for monitoring the status of email servers? I host my own email on a Linux VPS. If either my SMTP or IMAP servers stop responding to requests, I want ...
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1answer
6k views

SSL operation failed with code 1. OpenSSL Error messages: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol

I'm getting these errors when sending emails using our server's SMTP: SSL operation failed with code 1. OpenSSL Error messages: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown ...
0
votes
2answers
934 views

How to defend against botnet attack which tries to send a lot of mail to my server?

few days ago some kind of botnet attack started on my mail server which tries to send a lot of spam emails to certain domains on my mail server. Biggest issue here is that almost every attacker IP ...
5
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3answers
1k views

Exclamation marks being inserted into Emails at approx 1000 character mark

Have a .NET program that uses the System.Net.Main namespace to send an email via SMTP. Its on a customers site so from there it will go via a (series of?) SMTP relay servers before it reaches its ...
0
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2answers
164 views

What are the things to check to make sure my server's SMTP can be used by PHPMailer?

What are the things to check to make sure my server's SMTP can be used by PHPMailer similar to that when I'm using GMail's SMTP?
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2answers
425 views

Relay SMTP server

I am not a server administrator, but know my way around *nix and shell Right now my web server is set up to relay to an e-mail address that does not exists. How can I change it. Thanks for any ...
1
vote
3answers
270 views

SMTP Servers, and ISPs

I'm doing a bit of research for work regarding SMTP servers. Basically, our company is bringing some work in-house that we've been doing remotely through other companies. We have the need to work with ...
7
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3answers
59k views

554 - Sending MTA’s poor reputation

I am running an email server on 77.245.64.44 and have recently started to have problems with remote delivery of emails sent using this server. Only about 5% of recipients are rejecting the emails, but ...
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3answers
2k views

SMTP stress test

does anyone knows of any good software for Mac OS X or at least for RHEL/CENTOS Linux that I can run against my SMTP Server?
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3answers
2k views

IIS 6 SMTP Configuration

I'm having a problem setting up IIS 6's SMTP service. I configured it with the options that made the most sense to me (I have zero IIS experience) and no mail is being sent. I telnetted into the ...
1
vote
1answer
3k views

Reverse proxy for mailserver (SMTP + HTTP for web client)

I'm looking at doing some reverse proxy work for a mail server with corresponding web client. Both servers are running on the same machine, this is not a server with a high load. :) The solution I've ...
4
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2answers
5k views

How can I configure my postfix server so reject_sender_login_mismatch doesn't block aliases of the main account?

I've recently setup postfix, dovecot, amavis and a suite of other tools using iRedMail, and I'm having difficultly authenticating to my outgoing mail server. The issue is this: xyz@mydomain.com is ...
0
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4answers
2k views

Problem sending email from php

I'm trying to setup a server so that I can send email from PHP using the mail() function. I tried running a script that I know works but never got the email. Here is the log file: Sep 1 13:58:27 ...
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2answers
1k views

Improving IIS SMTP performance

Currently IIS is sending about 60k emails an hour. Is this a good number? How fast can IIS send? Are there any good ways to increase speed? Are there good alternatives for running on Windows?
1
vote
1answer
887 views

How can I force users to send mail using submission port (587) with Exim?

I would like to force users of a system to send email only using a submission port (such as 587) and then disable authentication on port 25 so I don't have users trying to authenticate using plain ...
2
votes
4answers
3k views

Postfix - sending emails to external domains?

I want to redirect my system mail to my gmail account, and I've setup postfix on an ubuntu server in an attempt to do so. However, when I telnet to 25 and send emails, the emails just appear to queue, ...
1
vote
1answer
212 views

Password error when trying to use sendmail as smtp out server

I´m trying to setup a sendmail server to receive and sent messages using it. The first part is done, but now I will want to use it to send (setting it as smtp in thunderbird for example), but when I ...
0
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3answers
377 views

Windows Server 2003: smtp and ftp services keep shutting down after a while

If I go into the IIS manager and start ftp and smtp, after about an hour or so they will have been shutdown. There is nothing in the event viewer to explain why they would shut down. IIS webserver ...
-4
votes
4answers
683 views

how to send a mail by telnetting through some SMTP server? [closed]

I wanted to send a mail by telnetting through smtp server "telnet smtp_Server 25" and want to send mail. How is it possible.. Also, please share something about CISCO products and what kind of ...
3
votes
6answers
9k views

How can I set up sendmail to forward all mail to an external MTA?

We have multiple applications that currently talk SMTP to an external MTA. The emails have arbitrary destination domains (they're emails to be sent to our users), but all from the same internal domain ...
1
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12answers
5k views

Why does yahoo block the emails we send?

We have a smtp server for sending email ,but recently we found that when we send hundred of newsletter to *@yahoo.com at a short time, it will blocked them. any one have better solution to solve it ...
3
votes
8answers
16k views

What are the possible causes of this error: “Unable to > connect to ssl://smtp.gmail.com:465”? [closed]

I'm getting this error on my local machine when sending emails using (gmail's smtp + PHPMailer + CodeIgniter), which I wasn't getting on our previous office (we had to move offices). Severity: ...
3
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1answer
2k views

How can I configure Exim to drop non-authenticated connections on alternate SMTP port?

I currently only allow connections on port 25 from a mail filtering service's IPs. I have Exim running on an alternate port for SMTP submission. This port needs to allow non-encrypted connections ...
2
votes
2answers
2k views

Self-hosted SMTP server in parallel to Google Apps

I am currently using free version of Google Apps for hosting my email. It works great for my official mails but except for sending out high volume mails (registrations, forgotten passwords, ...
1
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3answers
1k views

Backscatter Issue

Can somebody please help me with this issue. In our company we are having issues sending emails to @hotmail.com addresses. I have contacted Microsoft "Support" directly about this issue and they ...
0
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3answers
1k views

How to make postfix send email when fail delivery attempt?

i'm setting up postfix as a MX server. Basically it will receive email, do all filterings and route to domain SMTP server. In case of failure when trying to send the email to the destination SMTP, is ...
1
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1answer
408 views

McAfee Secure Messaging Service / Postini: false positive?

I'm puzzled by this email message that gets quarantined by McAfee Secure Messaging Service (it's based on Postini) for no reason that I can think of. Here are the Postini headers: X-pstn-2strike: ...
4
votes
1answer
177 views

Hot/Lukewarm mail server setup

We have two mailservers ("dubone" and "dubdeuce"), one does all the work while the other sits idle. We want to have a setup where if dubone is busy or down, dubdeuce can accept/reject/filter emails ...
0
votes
1answer
854 views

SMTP Connections in Lotus domino

Yahoo limits the number of messages that can be sent per SMTP connection to 5. (see. http://help.yahoo.com/l/us/yahoo/mail/postmaster/basics/postmaster-38.html;%5Fylt=AmQ249AWdyWDPc9ZukN6VGkIJHdG) We ...
0
votes
3answers
6k views

How do I lock down Exchange 2007 to accept email from a specific range of IP addresses only?

I have implemented a new Exchange 2007 server running on Server 2008 in our domain. We previously used Exchange 2003 running on Server 2003 and I had locked the Default SMTP Connector down so that it ...
1
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1answer
15k views

Postfix “timed out while sending message body” to “Microsoft ESMTP MAIL Service”

For some reason we cannot send larger email to one of our customers. Small emails are fine, but even a message with a 1MB attachment fails to deliver for several hours - Postfix logs keep filling with ...
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1answer
1k views

Change email domain OS X Server

I'm having trouble setting up the mail service correctly on my os x leopard server. In server admin, under Mail>General the domain is set to "mydomain.net.nz", and my host name ...
16
votes
6answers
14k views

How to Setup Ubuntu Mail Server with Google Apps?

I have a domain, let's call it foobar.com. All of the MX records for foobar.com point to Google's mail servers because I am using Google Apps for your domain to manage it. It's great because everyone ...
0
votes
2answers
2k views

Virtual SMTP Server not relaying mail

In our LAN, we have a development box with IIS 7 that has an SMTP Virtual Server installed. All development applications send outgoing mail to this virtual SMTP server, and it in turn relays the mail ...
0
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1answer
264 views

Sharepoint 2007 Incoming Mail broken

I have been using incoming mail settings on a number of sites within a site collection for the better part of a year, however it broke on Monday and I have not been able to find out why. It is ...
1
vote
3answers
621 views

Forwarding all mail to a single dev box on IIS via virtual SMTP

I am trying to set up a development environment for our web server. I would like all emails that are relayed by the server go to a specific mailbox, regardless of who they were sent to. For example, ...
0
votes
4answers
4k views

hmailserver - I suspect that a spammer may be using my server

First, I'd like to verify whether or not a spammer is using my server. I've turned logging on -- which logs should I be checking specifically? Just SMTP? Second, I'd like to configure my ...
1
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4answers
3k views

Sending bounce mail messages customized for employees no longer with the company

Currently we use a hosting company for our Exchange services. We are considering a switch to Google apps, but that is in a pilot program at the present time. Our Exchange provider and Google Apps ...
5
votes
4answers
13k views

Easiest way to send a test email from a server, to test settings?

Using Windows (2008) is there an easy command line tool that I can use to send a test email from a server to test the SMTP, user authentication, ports, etc... without writing my own?
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5answers
4k views

IIS 6 SMTP how to test email is sending

My server(Windows Server 2003) is running IIS 6. It does not seem to be sending any emails. How can I go about trying to find the fault?
1
vote
1answer
5k views

How to configure IIS SMTP server to relay outgoing messages to another local SMTP server?

I'm using Windows XP on my development machine (IIS 5.1). I installed hmailserver on my machine and now want to configure IIS to relay all outgoing messages to hmailserver, what should I do in IIS to ...
2
votes
4answers
4k views

Exchange 2003 - how to route ALL mail (including internal) via an external SMTP gateway? (Or, domain/mail server migration for the masses.)

Short version: Is there a way to have Exchange route all email, including internal AD users that would normally be routed directly, through an external gateway? (SMTP, probably a "Smart Host" in ...
0
votes
1answer
993 views

How do I configure SMTP for DB2 9.5?

During install I know the wizard asks for an SMTP server for notification. But I can't find these properties now when we really need it. We're running on Windows Server 2008.
0
votes
1answer
126 views

SMail configure listening port/address?

I try to configure my smail-system. I want it to listen only on localhost/127.0.0.1 But when I check my system via nmap myredirectingdomainname.com it shows me the open port 25. Can you help ...
0
votes
1answer
72 views

How would I test rblserver?

I'm using few rbl servers, and all of the sudden i see slowness, as soon as I remove all rblservers, it works very fast as it used too, other than removing one by one server is there a way to test rbl ...
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vote
1answer
1k views

Best way to throttle smtp email on Windows Server 2008

I have a server with SMTP set up for my site's outbound email. In order to not get blacklisted I'd like to limit outbound emails to under an arbitrary threshold (let's say 500 per hour). What's the ...
8
votes
4answers
12k views

How does a Reverse DNS lookup work with regards to spam filters?

I have heard that most spam filters use a reverse DNS lookup on the originating IP address of the sending SMTP server (or something like that) as part of the verification process. I want to make sure ...
2
votes
2answers
2k views

IIS SMTP Service Routing Outbound Mail

Regarding the SMTP service that is including in Microsoft's Internet Information Services (IIS) 6.0. I have it in my mind that the built-in SMTP service is not capable of routing outbound messages, ...
1
vote
3answers
1k views

Configure IIS 5.1 for SMTP

I've tried a number of solutions that I found on the internet, but none worked. I can telnet to port 25 and send an email via IIS 5.1 listening on that port, but the email never gets delivered. I see ...
-2
votes
1answer
2k views

How to turn on SMTP relaying? Getting error: “SMTP Error: The following recipients failed [address]” [closed]

Attempting to configure some software on our server to send email via SMTP. When testing it, get this SMTP Error: SMTP Error: The following recipients failed [address]" Based on my research and a ...