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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PTR Record Troubles

I am having a hell of a time getting our PTR record right. Our current PTR zone looks like this: $ttl 38400 @ IN SOA ns1.domain.com. admin.domain.com. ( 1268669139 10800 ...
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1answer
10k views

Allow certain IP(s) to send almost any e-mail through Exchange 2010

We recently migrated form Exchange 2000 (yes I know...) to Exchange 2010 and went through the horror of configuring it. First of all we don't use ForeFront, sadly(?) we can't. Before I ask my ...
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1answer
166 views

Configuring sendmail to only use starttls in client mode

Is it possible to configure sendmail so that it will only connect to a remote smtp server when STARTTLS is offered there? I so - how do I do it?
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1answer
464 views

Setup Postfix Mail Server in Ubuntu 10.xx for a VirtualHost

I want to work with Postfix in Ubuntu 10.xx (.04 or .10) so that one of my virtualhost is the domain name or "mail name" as the configuration calls it for Postfix. How do I do this? ANd how do I ...
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3answers
2k views

Allowing Sharepoint to relay email through Exchange

I have written a Sharepoint 2007 web part that sends a field from a form to a specified email address. I have got the form working as I require, but at present it can only send to internal email ...
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2answers
493 views

Development Environment SMTP Server - Rewrite email recipient address

I am looking for a way to setup an SMTP server in our development environment that will run on the local dev server and rewrite the recipient email address to our debug address, without effecting the ...
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2answers
414 views

Smtp relay service recommendation to increase deliverability [closed]

I need a recommendation for a email relay service to use on multiple domains with C#. I don't want to worry about blacklisting and am looking for increase deliverability on confirmation emails etc. ...
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2answers
865 views

SMTP not sending email in one server, but sends in another server

I have a section of code that sends email from SMTP server. The code is carried out webservice & smtp server value is picked up from web.config, while the code hosted on server1 works (send/...
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1answer
7k views

How to make Request Tracker use an external SMTP mail server?

I am using Ubuntu 10.04 and by following this tutorial I have made RT run well in everything except for sending outbound emails. The difference is, I need to make RT use an external, existing mail ...
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2answers
2k views

New server cannot send mail

I'm retiring our 10 year old web server (no more Pentium III - yay!). A few of the pages on the web site it hosted have forms that cause e-mails to be sent to certain people. These e-mails are sent ...
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3answers
289 views

Do MTAs always queue mails when they can't connect to dest MX server?

At our (small) office we're deciding whether to have our MX record point to our local Exchange server. I was a bit worried about downtime, so thought that I ought to set up a backup MX server. Then I ...
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2answers
99 views

E-mail alias, bandwidth usage

I had simple mail server and my question is about bandwidth usage of e-mail aliases. So i had eq danny@mysvr.com foward: danny@gmail.com And question is mail demon do: [MAIL] -> @mysvr.com /* ...
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2answers
146 views

Testing email locally on a windows machine

This is a question I've tried to answer for a long time now. I'm currently working on a personal project on a windows XP machine and it's come to the point where I need to send emails to test some ...
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1answer
403 views

Email flow problem in Exchange 2003

I have a problem whit some emails that are not being delivered to the user inbox. The SMTP server on the DMZ that receives email from the internet is a Symantec Brigthmail Gateway, this server reports ...
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2answers
637 views

php mail() on IIS6 not sending

This is related to an IIS server problem, or a PHP configuration, not php code. I'm running an IIS6 server with PHP installed on it, the following php code will never send an email: mail("user@...
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1answer
150 views

Exchange 2007 inbound SMTP Set-up

What would the setup look like if my network looks like this: 192.168.1.10 - Exchange server 192.168.1.1 - FireWall / Internal 10.0.0.0 - FireWall / External (imaginary IP..) 20.0.0.0 - mail.myisp....
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1answer
1k views

Exim4 SMTP Authentication to Courier

I've recently setup Exim4 on an Ubuntu 10.04 server with Courier. Everything is working fine for local mail deliver, the only missing piece is SMTP Authentication. I have an account setup on the ...
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3answers
529 views

How can I use dyndns with Ubuntu and send emails from it

How can i use dyndns with Ubuntu and send emails from it? I want create a free domain with dyndns.com (mydomain.dyndns-at-home.com) How can I link the domain with Ubuntu ? How can I send emails ...
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2answers
5k views

How to configure fetchmail to send messages from remote smtp server to Gmail? [closed]

I've been trying to setup email forwarding through fetchmail from remote smtp server to Gmail account, although messages are constantly coming to my local address and accessible via "mail" command. ...
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2answers
287 views

Do SMTP servers require that the sender in an email be the authenticated account?

Do SMTP servers require that the sender in an email be the authenticated account? Or is this something that can be configured on the server? To test out my application, I've set up a Gmail account ...
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1answer
707 views

Postfix: connects and then disconnects immediately

There has been another question like this logged before, http://serverfault.com/questions/86315?tab=oldest#tab-top, however it was never really resolved. I have multiple instances of postfix running ...
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4answers
1k views

Free SMTP server for Windows

Are there any free SMTP mail servers that run on Windows?
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2answers
2k views

how to specify maximum # of outgoing emails from SMTP by domain

i have sendmail, and i am sending mailshot every week. how can i tell my sendmail to limit the number of outgoing emails to a specific domain per hour (to avoid getting blocked by mail servers) for ...
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1answer
1k views

Microsoft Exchange Server - Fails to receive e-mail from 'yahoo.com' - HELO Vs EHLO

All e-mail sent from a yahoo.com server to my domain fails to be correctly received. The difference between yahoo.com and other domains is that they open with HELO rather than EHLO and therefore ...
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1answer
1k views

iis 7 caching PDF files causing wrong attachments to be sent

I've got a weird problem with my web server. I have a page that creates a PDF file and a button to send that same file as an attachment in an email. So I hit create, then press send, create, then ...
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3answers
5k views

Trouble accessing port 25 on an EC2 instance

I don't seem to be able to access port 25 on an instance on Amazon EC2. I have opened the port in the security group and in the iptables firewall. I have opened other ports (including 22 and 80) the ...
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5answers
343 views

Setting up DNS records for a shared host

So I'm setting up this server right now that'll host multiple websites / domains. What are the current best practices with regard to DNS records? I admit to 'just having done something' up to now, ...
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4answers
3k views

DNS and PTR for SMTP: shared IPs and subdomains

This question is similar to others about PTR and DNS for SMTP, but one specific aspect was unanswered: what if one machine does SMTP and HTTP on the same IP address. For example: SMTP at mail.example....
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3answers
150 views

E-mails consistently delayed

My application is configured to send out email notifications when an event happens. Sometimes this is fairly often (every minute), and every email has an attachment (up to 6-10 attachments), so each ...
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2answers
744 views

Is it safe to ublock 587, SMTP submission port?

We have had problems before with SMTP port 25 (smtp) - some PC's were sending spam mail throught that port. So we blocked that and only allowed only outgoing smtp servers we needed. Howerver, i read ...
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1answer
316 views

Open Relay for internal IPs

How do I enable SBS 2008 and exchange to send mail via SMTP without authentication? I have a handful of network scanners that don't have anyway of configuring SMTP authentication. So I want the SBS/...
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3answers
1k views

Outgoing emails not working from my exchange server

I have an exchange 2003 email server that outgoing emails do not appear to be going out. The emails get as far as the email queue and don't get any further. I am getting lots of messages like the ...
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1answer
7k views

Postfix + SASL = “Relay Access Denied” when sending from outside the network

I have in /etc/postfix/main.cf: smtpd_sasl_auth_enable = yes smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination and SASL seems to be working: $ ...
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1answer
305 views

SMTP server on Server 2008 r2. Sorting Mail in Drop

I've managed to configure my smtp server to send mail using asp.net stuff. This was my main objective and I got it to work. Now I want to tackle incoming mail, because well, I have an smtp server so ...
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1answer
76 views

If i subscribe one email list on another, do the messages cycle forever? [closed]

If i subscribe one email list on another, do the messages cycle forever? why not?
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1answer
540 views

Exim as relay server

Hi I have exim running on port 8900 and another mail server running on port 25. This mail server will be used to relay outgoing emails to exim. But somehow I am getting this error from exim 550, '...
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5answers
4k views

What purpose does an SMTP server serve? Why can't email be sent directly from email client to recipient? [closed]

An SMTP server does not seem to be the natural way to send an email. It just relays the email to recipient. Why can't we do without SMTP servers? I have been puzzled for a few years by this.
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2answers
546 views

Cannot send mail to one particular domain

We cannot send mail to one particular domain. When we do, we get a 'message delayed' message from Exchange, then a #550 4.4.7 QUEUE.Expired; message expired ## message from Exchange. I can send to ...
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2answers
11k views

Is it possible to set up Exchange so that all outbound emails to a specific domain must go through TLS?

And that, if that domain doesn't have TLS turned on, email-sending fails? I've been looking at setting up SMTP send connectors, but there doesn't seem to be an option to enforce TLS?
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3answers
1k views

SMTP relay to multiple hosts

We are in the process of switching our email from a locally hosted server to Google apps. We have a lot of users and I'd like to be able to switch them over one at a time so I don't get inundated with ...
3
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1answer
3k views

iptables not letting SMTP through

I am trying to set up iptables to allow SMTP connections, and it does not seem to be working. Here is the output of iptables -L: Chain INPUT (policy ACCEPT) target prot opt source ...
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2answers
848 views

Exchange 2003 incoming email attachments have incorrect size

I'm stumped! When I receive messages with attachments from external mail servers, the attached file size is incorrect. I'm running Exchange 2003 locally. The problem seems to be happening at the ...
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2answers
443 views

WAN IP displayed in Headers when sending via SMTP Virtual Server

On my Windows server 2008, I have IIS 7, ColdFusion 9, and the virtual SMTP service installed. I host several applications on the server that send emails using the virtual SMTP service. Each ...
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6answers
385 views

I'm hosting reseller and I got spam problems. Please help to solve

Our provider suspended our account with 5000+ clients and their sites. The reason was that the whole IP range was blacklisted by SpamHouse, but our provider did not explain what emails, form what IP ...
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2answers
3k views

postfix/smtp Connection timed out

usually my posftix/smtp works fine until now, it get timed out on almost every destinations. I drop all the firewalls, and start to accept all. I check the firewall. and there is no problems. $...
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2answers
6k views

how to use phpList with external (3rd party) SMTP servers

Like the title says I am trying to have phpList on my server and relay the messages through 3rd party service (e.g. TurboSMTP.com). I am having trouble finding any setting in the application or in any ...
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1answer
203 views

Backup postfix relaying to itself

I have two machines running postfix, one is the primary mail server, the other is a backup relay. Both servers have an MX record, the backup having a lower priority. Most mail is relayed fine, but ...
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1answer
2k views

Can't make Dovecot communicate with Postfix using SASL (warning: SASL: Connect to private/auth failed: No such file or directory)

Solved. I will leave this as a reference to other people, as I have seen this error reported often enough on line. I had to change the path smtpd_sasl_path = private/auth in my /etc/postfix/...
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1answer
181 views

Can I send email from the SMTP server in Windows 2008 from multiple domains?

I have a windows server 2008 instance and several public facing websites running on it. I have a need to send emails from this server - can I use the SMTP server bundled with Windows Server 2008 to ...
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2answers
301 views

MailEnable on server with no DNS

Hi I want to test MailEnable on a vmware server that is not connected to a DNS. I am not allowed to install a dns on the vmware server. Is it possible to test MailEnable in this environment?