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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How to setup external mail addresses without external autodiscover tries?

We have a little Exchange/Outlook installation here that fetches the mails from our provider with POP3. Now to be able to send emails outside our organisation, I added another SMTP address to the ...
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6answers
553 views

ISP blocking port 25

My ISP has started blocking port 25 so I can not send email through my dedicated server any more. I have several options: Send email through the SMTP server provided by my ISP. Any problems with ...
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1answer
4k views

pfSense port forwarding email blocks some senders

We're using a pfSense firewall with a static public IP. TCP port 25 is forwarded to the mail server on the DMZ, according exactly to the directions here. This works great for most senders, and email ...
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5answers
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mail loops back to myself | postfix

Hi I have an issue with bounced mail it does not happen all the time but at the same time is very frequent. Most of the time if I send an email to an address that does not exist then i get a bounce ...
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3answers
500 views

Alternative SMTP-Proxy

Currently we are using bitdefender for mail servers to scan for spam, viruses and content filtering. We chose bitdefender as it receives all incoming emails and forwards them to our internal windows ...
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3answers
4k views

Postfix configuration - Uing virtual min but server is bouncing back my mail

I have no experience in setting up postfix, and thought virtualmin minght do the legwork for me. Appears not. When I try to send mail to the domain (either abuse@xxxxxxxxxx.com domain@xxxxxxxxxxxx.com ...
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1answer
1k views

Exchange 2007 - Forward outbound mail to external SMTP server?

How do I configure Exchange Server 2007 to send outbound email thru an external SMTP server?
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2answers
1k views

Emails returned by hotmail

Some emails I send (from php) are returned by hotmail with this message: <xxxxxxx@hotmail.com>: User and password not set, continuing without authentication. 65.55.92.136 does not like ...
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1answer
478 views

How can I strip EC2 domain info from email headers?

I run a web application on Amazon EC2 and, because of the shortcomings with AWS and reverse DNS, I direct email to a dedicated SMTP server running Postfix at a different provider. Unfortunately the ...
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2answers
1k views

Server hacked for SPAM, The BAT in X-Mailer

Our server has been hacked and I am trying to track down the cause. The server is being for SPAM purposes and it looks like IIS is being using to send the emails as the badmail and queue folder are ...
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1answer
3k views

What is a good SMTP server for testing email system on Windows [closed]

I need a simple "fake" SMTP server or decent real SMTP server than can be configured to just dump all the mail it receives. I've tried Dumpster and it does nothing but error out on me. (I'm not much ...
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2answers
3k views

How can I configure the IIS SMTP service to store *all* emails (regardless of domain) in the drop folder?

How can I configure the IIS SMTP service to store all emails (regardless of domain) in the drop folder? I'm trying to catch all emails sent to an SMTP server during testing. I don't want to relay the ...
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3answers
3k views

Setting up SMTP in IIS6

I'm used to using IIS6 for administering websites but this is my first time using it as a mail server. I've got the POP3 service working fine and I can get incoming mail without any problems. What ...
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2answers
584 views

Bouncing email between webhost4life & mail.com

Looking for a bit of advice diagnosing this... let's assume my personal email address is tony.blair@unforgettable.com. The unforgettable.com domain is associated with mail.com - I use it as a ...
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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 ...
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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 ...
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8answers
10k 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 ...
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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 ...
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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 ...
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1answer
288 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 ...
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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
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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, ...
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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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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 ...
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3answers
7k 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.
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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 ...
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4answers
202 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 ...
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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 ...
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2answers
920 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 ...
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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 ...
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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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2answers
424 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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3answers
268 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 ...
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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 ...
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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 ...
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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 ...
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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?
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1answer
879 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
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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
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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 ...
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3answers
376 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 ...
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4answers
661 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
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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 ...
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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
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7answers
15k 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
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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, ...