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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2answers
162 views

EMail SMTP issue

I am running several websites on a Windows VPS that have "recommend this to a friend" type of emails. I get frequent bounces. The provider allows us to configure reverse DNS records for all the ...
-2
votes
4answers
1k views

Not able to send mail through smtp.gmail.com

I want to send mail through "telnet smtp.gmail.com 25" but an error is prompted when sending a message "530 5.7.0 Must issue a STARTTLS command first". I am working on Ubuntu Linux Server. I ...
3
votes
8answers
9k views

Emails are being rejected by some email providers

I have this asp.net application that sends out emails. The SMTP server is iis6. The emails are being sent on behalf of our application users and they have different domain names. Most of the email ...
2
votes
2answers
3k views

Reject obviously spoofed messages in Exchange 2007 SP2

I have an Exchange 2007 SP2 server which happily accepts SMTP messages whose sender is SomeRandomString@mydomain.com and the recipient is SomeRealUser@mydomain.com; this leads to all sort of spoofing ...
0
votes
2answers
1k views

Stop Delivery Status Notification (Failure) messages with Windows 2003 Server SMTP Server

How do I stop the SMTP Service on Windows 2003 (not exchange) from sending "Delivery Status Notification (Failure)" messages? I'm trying to prevent a trick that spammers use of sending a message to a ...
0
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1answer
287 views

ISA Server 2004 Hotmail Filter

At the moment we have a rule that limits SMTP traffic through TCP port 25. If I do a test email to a @hotmail.com address the email doesn't arrive, nor are there any bouce-back errors. If I send from ...
1
vote
1answer
306 views

Block SMTP Relay Commands with Windows Server 2003

I use the POP3 Service that comes with Windows 2003 and that requires that I allow SMTP Anonymous Authentication. Although I've turned off relaying, I would like to do is reject any commands that ...
2
votes
2answers
6k views

How to configure Postfix to send bulk email at a “reasonable” rate per scond

Maybe a postfix newbie question. Our linux server is properly set up with an SPF record, and we don't send mass email at the moment. But, is there a simple way to configure the postfix mail queue, ...
28
votes
7answers
66k views

SMTP server on Windows 7

Is it possible to install the SMTP server that you can install in Windows Server 2008 in Windows 7? Or something similar? I'm developing an application that will make use of it and I want to be able ...
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votes
1answer
3k views

Windows Server 2003 TCP port mapping / port forwarding

I've recently had an issue with the ISP of a few of my clients in which they've blocked TCP port 25 and de-commissioned their old mail server in lieu of Gmail. Also, our business email has been hosted ...
1
vote
3answers
6k views

What's the best way to check if an SMTP server is SSL-enabled or not?

What's the best way to check if an SMTP server is SSL-enabled or not? Follow-up question: How do I make it SSL-enabled if it's not yet SSL-enabled. The OS is CentOS.
3
votes
1answer
2k views

Configure Domino to use SMTP routing and hMailServer

I have been trying for a couple of days to set up a Domino 8.5 server. Basically, I want everything to be run inside a local network. Right now I can send email to other user in the Domino directory ...
2
votes
4answers
201 views

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 ...
0
votes
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
910 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
votes
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
votes
2answers
162 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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vote
2answers
422 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 ...
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vote
3answers
267 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
votes
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 ...
2
votes
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
votes
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 ...
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votes
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?
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1answer
876 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
210 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
votes
3answers
374 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
641 views

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

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
5answers
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
vote
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
7answers
14k views

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

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
votes
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
vote
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
votes
3answers
996 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
vote
1answer
407 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
176 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
842 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
vote
1answer
14k 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 ...
1
vote
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
votes
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
604 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
vote
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 ...