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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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 ...
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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
849 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
444 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
182 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
302 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?
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2answers
72 views

Smtp Server external to external

I have hMailServer set up on my windows server 2008 machine. I just started noticing in the logs that there are a lot of entries related to people trying to send external to external mails (obv spam?)...
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4answers
198 views

Server 2003 answers ping, but wont serve http, ftp,smtp or pop3

After reboot, my server wont respond to any incoming request until it is rebooted again. Then, about 5-6 hrs later, any website on it will return a ping, but it will not serve the page, nor will it ...
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1answer
68 views

How can I make so IIS SMTP uses Credentials when connecting

MY SMTP is working without any password or username, Iam trying to configurate my SMTP so it uses credentials when sending mail. On my ASP.net app I have added credntials, but the SMTP works also ...
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2answers
942 views

iptables only allow smtp connections with start tls

Is it somehow possible to block/abort unencrypted smtp connections with iptables? effectively rejecting all connections which dont do a start tls.
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2answers
626 views

SMTP server hacked and Spammed - hotmail.com blacklisted

We recently set upp a new SMTP server and during the night someone used it to spamm. Next day We saw that it was over 90 000 mails in the queue folder. After that I chaned the incoming port and also ...
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2answers
110 views

Postfix attempting all delivery virtually

We have Postfix configured for virtual domains and virtual mailboxes and it's running quite nicely. However, Postfix now thinks that everything except my_destination should be delivered virtually. ...
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1answer
129 views

SMTP Server software above Windows 2008 SMTP?

i need some software which has more functionality than regular Windows built-in SMTP server. What i'm interested in mainly is fine looking logs of successes versus failures and email scheduling. Is ...
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3answers
5k views

550 Requested action not taken: mailbox unavailable

I setup a small box with Server 2003 64bit to be used as a webserver and email server for a small school. Real simple stuff for a few users. A simple website and a handful of emails. rDNS and spf ...
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1answer
153 views

Recommend a reasonably priced email provider?

We have around 50 domains that aren't core/key business but ideally we want to be able to have the MX records pointing to someone to accept mail for the following: abuse@ and postmaster@ for all the ...
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2answers
484 views

SMTP Relay to Multiple Hosts

I have a situation where I need to configure an MTA to relay messages for a single domain (@example.com) to multiple (3) seperate SMTP servers. Email for user@example.com received on SMTP-1 needs to ...
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3answers
2k views

Unauthorized email is sent using google apps registered domain

I have a domain name 2m.lt registered and added to google apps. There is an option there that all the email adressed to my domain (*@2m.lt) is forwarded to my mail email account (admin@2m.lt). Well ...
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1answer
301 views

Sending through SMTP to same domain [duplicate]

Possible Duplicate: IIS SMTP server (Installed on local server) in parallel to Google Apps We have a website set up for www.clientname.com(and also clientname.com), running on a windows server ...
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2answers
363 views

SMTP server to be used for Email Marketing Service

I am trying to build a email marketing service company. I am a .net programmer and I have played around trying to build a custom SMTP server but a lot of problems came up when domain keys into play. ...
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1answer
327 views

Debian/PostFix/Gmail not playing well

I followed these instructions and took hints from other sites. I cant get my server to send emails using google apps (i spent 3 hours on this already.) I get the error Authentication Required. ...
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3answers
4k views

How can I forward to a specific MTA based on email address?

How can I forward incoming messages to a specific MTA based on the username portion of the recipient's email address? I would prefer linux-based software, but Windows would work too. Background: Our ...
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7answers
15k views

My SMTP's outgoing mail gets bounced [duplicate]

I've got a ISPconfig 3 production server set up, running Ubuntu Server 9.04. My e-mail gets delivered ok to almost every other server I send mail to except for one (smtp.chello.nl which bounces my ...
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1answer
375 views

Find my POP server's address

I recently took over a server (Ubuntu 9) that is set up to send and receive email and uses RoundCube as its webmail interface. The folks who use the machine don't like RoundCube and want to do ...
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1answer
55 views

Unix inbox line wrapping behavior

I've developed an application that parses data from unix inboxes, and retrieves the messages using IMAP. The main issue I'm running into right now is that the flat file inbox in /var/mail that stores ...
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1answer
2k views

Problems using hmailserver as outgoing SMTP server

I have hmailserver set up and accepting email for projectattack.co.uk domain - I can connect to the server through port 110 pop3 using both gmail and mail.app on osx I have a cname pointing smtp to ...
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1answer
120 views

Is there a way to detect recipient's mail server e-mail size limit?

I want to write a script that sends an e-mail with attachments (different sizes, different recipients). I wish prior to sending e-mail, somehow detect if recipient's mail server can handle the size of ...
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3answers
222 views

setting up an email server [closed]

i'm about to stop using gmail apps premium and i'm looking at using hmailserver and either zimbra or roundcube as the front end. My question is this: does hmailserver fit well with zimbra or ...
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6answers
893 views

Understanding what needs to be in place for a server to send outgoing email from a linux box

I am attempting to configure an openSuse 11.1 box to send outgoing email for a domain that the same server is hosting. I don't understand enough about smtp servers and the like to know what needs to ...
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2answers
2k views

Forwarding only bounce messages to a different SMTP server

I have a Postfix SMTP server that sends transactional emails from a web service. These messages use VERP for the return path, so bounces go back to an address like this: bounce-7232-useremail=...
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2answers
61 views

What possibilities do I have if I want to send mail from Windows Server 2008?

My intention is to be able to send mail from Windows Server 2008. What possibilities do I have? SMTP client, SENDMAIL etc.? What would be the best solution for this?
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2answers
92 views

Can I run two email service on 1 domain?

Can I run google email service and my web hosting email service on 1 domain? domain.com <--- on google service (top level domain) mailman.domain.com <--- on web hosting service (sub domain)
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2answers
330 views

Setting up an smtp server to send mail for a domain hosted elsewhere

I'm not a server admin, so these might be dumb questions... I have a client I'm building a web app for, who asked me to set up a mail server on the VPS it's hosted on to send emails rather than send ...
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1answer
372 views

Exchange SMTP Not setting appropriate message-ID

Related to my post here on SO: http://stackoverflow.com/questions/3638584/smtpclient-sending-bad-messageids/3638682#3638682 It was brought to my attention that our exchange settings may be incorrect....
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1answer
476 views

Where/How Can Spam False Positives Be Reported To MessageLabs?

An email I sent got flagged as spam by MessageLabs on the recipient side. I'd like to proactively engage MessageLabs to tell me more about why this got quarantined (or at least fix it). Is there ...
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1answer
1k views

WSUS Email notification

Can i use gmail as SMTP server for wsus ?
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1answer
156 views

Secure e-mail with SMTP Virtual Server in Windows 2008

Is it possible to send encrypted and digitally signed e-mail messages using S/MIME through the SMTP Virtual Server component included in Windows Server 2008 or do I have to use Exchange? If it is, ...
0
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3answers
3k views

Postfix with no auth setup in Ubuntu?

Now, postfix has been setup by auth. I want to remove user login with username and password. I want to make anonymous SMTP Mail server. What path should I change or what line should I remove ? my ...
0
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1answer
3k views

Interpreting Exchange message tracking log events for unreceived emails

I'm working on a new Exchange 2010 server that may be having issues sending emails out to a particular ISP. I have verified it is not on any blacklists, no bounce messages are ever received, and the ...
3
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3answers
238 views

Mail relays or SMTP services for use in code

I'm looking to start using an SMTP or mail relay service. I've found quite a few out there, but I'm not sure if there are advantages to one vs another. The only requirements I have are: can send "...
2
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5answers
1k views

Failed PCI Compliance - The remote SMTP server is vulnerable to a buffer overflow

Hey guys, I have tried allowing the scanners IP to be accepted through IPTABLES into the SMTP port, but the scan still fails. This is the error: The remote SMTP server is vulnerable to a buffer ...
3
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1answer
1k views

qmail responds 502 unimplemented on STARTTLS

I am trying to send mail with php using the PEAR Mail_queue package. It should be working, and it appeared to work twice, but for some reason I keep getting the following error response from qmail: ...
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1answer
2k views

Why does Exim puts emails on hold if there are frozen messages in the queue?

I've a CentOS with CPanel server working as a SMTP server, which currently uses 20 different hostnames and IP addresses to deliver email for an email newsletter service. However, it's extremely slow ...
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1answer
528 views

How to setup a web server with remote SMTP

I have 2 severs, both running server 2008 (R2) One is the web server, one is running as a mail server. The setup I want is that any mail sent from apps (php, asp and asp.net) on the web server are ...
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0answers
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Ariel will not send through our SMTP server

I'm currently working at a university that uses Ariel software to send ILL documents to teachers at other universities. They do this by e-mail the documents to the users. We recently switched from ...