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 share a SMTP domain between MDaemon and Exchange?

I need to setup coexistence between MDaemon (13.0.5) and a Microsoft Exchange system (Office 365); the two systems should share the same SMTP domain, and each one should forward to the other any ...
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430 views

Set up a Postfix server on Ubuntu for use with Apple Mail (or any mail client)

I set up a Postfix server on my Ubuntu VPS and it works for sending email from the mail utility in the command line. I set up SPF records, DKIM, pretty much everything I could read about. However, I'd ...
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2answers
955 views

Spam mail through SMTP and user spoofing [closed]

I have noticed that it's possible to telnet into a mailserver that I own and send spoofed messages to other clients. This only works for the domain that the mail server is regarding; I cannot do it ...
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3answers
128 views

SMTP server force outbound traffic

I'm having some trouble with setting up a SMTP server on a windows server 2003 machine, while trying to send emails using PHP through the internet, but to domain email addresses. Common info: ...
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2answers
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Does SendMail Support Outbound TLS Encryption WITHOUT additions to the sendmail.mc file?

CentOS 5.x Does SendMail support opportunistic TLS "out of the box"? I'm used to having to explicitly add the following blurb to /etc/mail/sendmail.mc define(`confAUTH_MECHANISMS’, `LOGIN ...
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How many emails per second is too fast?

I have a growing online business and a dedicated server that I use to send out the occasional newsletter. As it grows past a few thousand customers, I wonder how I can send emails faster without being ...
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2answers
2k views

SMTP unroutable address

I have set up gmail google app accounts for our own domain, domain.com, so that email is handled by gmail. I.e. MX records point to google servers, A records to our own server IP. This works fine. ...
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2answers
944 views

What should be the spf record for my domain?

I have my own registered domain. I have a dedicated IP for my domain. I use a shared hosting service for my website. I want to send mail with php's function mail();. I have created one email ...
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2answers
2k views

What does SMTP 'designate' term mean?

I received a gmail from the address of a friend who is long out of contact. It is possible to use a utility/service such as mail2web.com to define a sender email that differs from the true sender ...
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636 views

Exim managing bounced and failed messages

What is the best way to handle bounces and immediate failures with Exim? An email sent to a large mailing list will generate a large number of immediate failures as well as bounces. I'd like to ...
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1answer
630 views

What SMTP port threats to protect against?

I'm planning on creating a simple SMTP Server to auto parse incoming emails to integrate into an application. I chose this method over polling a pop3 account so that I can get instant notification. ...
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796 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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SMTP server requirements

Could someone help answer a few questions regarding the networking / DNS requirements for an SMTP server? Assume the server is setup already. Is a MX record required for SMTP? TCP port 25 open to the ...
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3answers
444 views

SMTP for multiple domains on virtual interfaces

The setup is like this (Ubuntu 9.10): eth0: 1.1.1.1 name.isp.com eth0:0 2.2.2.2 example2.com eth0:1 3.3.3.3 example3.com example2.com and example3.com are web apps which need to send ...
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3answers
214 views

How to distribute email's delivery between 2 or more servers

We provide Email Marketing service through our online App. We have about 30 customers. And each one has it's own mailling list (5k to 20k emails each). What we really want is to distribute email's ...
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8answers
441 views

Best email server solutions on Windows

We are currently use mdaemon and we have over than 1000 box of email. mdaemon seen to rich is limit because is always crash. We are looking for another email server, could be exchange or other, ...
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1answer
644 views

I want Lotus Domino to only send one email to users that are both recipients and members of a cc'ed lotus group

Lotus Domino 7 and now Lotus Domino 8.5 The scenario: A@mycompany writes an email to b@internet and cc's it to group@mycompany. A@mycompany is a member of group@mycompany. With the initial email ...
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3answers
7k views

sendmail relay status

I have a RHEL3 server with sendmail configured to relay mail to: # "Smart" relay host (may be null) DSmailrelay This relay server is an exchange server not administered by me. A few days ago its IP ...
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2answers
5k views

Where are the SMTP settings saved in IIS7/Win2008?

I have a problem getting SMTP to work with an ASP.NET app I have (the error I get is "Cannot get IIS pickup directory"). The app delivers the mail to SMTP using the pickup directory. I already know ...
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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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1answer
77 views

Failed Gmail SPF check when importing mail through IMAP from our mailbox when original email was sent with ESMTP headers

We have a strange situation: we receive an email with ESMTP headers in it our server accepts it, it's fine we import that mail in Gmail like any other emails from our boxes Gmail makes SPF check ...
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2answers
343 views

Dovecot pop3: Disconnected for inactivity

We've application fetching messages from mailbox inbox. Once, application stoppped fetching, then we'd the following in maillog: Aug 15 11:03:47 server_name postfix/virtual[16743]: 731E258003: ...
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exim4 - Why is rate limiting outbound mail to a smarthost only working with acl_not_smtp?

In an effort to rate limit outgoing emails per recipient (all emails are sent by the same user), I've been doing some testing in a very simple environment: ...
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1answer
125 views

Postfix only delivering mail locally (instead of correct destination)

For whatever reason, postfix cannot send email to my google apps account. It says the message is sent, but I've confirmed with google apps support that the message isn't being received. (Thus it is ...
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1answer
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Postfix relay mails from a single domain and IP

we have an Mdaemon server which redirects outbound mails to an external basic Postfix relayer. We have configured firewall rules (in front of postfix server) to accept smtp requests only from the ...
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1answer
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Bizzare routing: EITHER accepts emails OR sends depending if NetworkManager is running

Due to an otherwise unrelated hardware failure (long story) I've been forced to return an older Fedora Core system into service as a mail server. It's primary service is as a file server and Samba ...
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614 views

How to drop messages containing a specific text from exim4?

I am trying to filter messages received by exim4 on Debian by using a system_filter but for some reason exim4 keeps delivering them even if I know that the filter is loaded but the conditions are ...
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1answer
339 views

What is a good third-party SMTP software for custom logging?

I am currently using IIS 6 SMTP to send out some of our mail and I unfortunately amn't finding the logging performed by it to be verbose enough - nor am I able to customise it to the level I would ...
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2answers
405 views

How can I configure sendmail (or another mail server) to accept outbound mail, but to not send it out?

Is it possible to configure sendmail to accept all outbound email but to not send it out? Either it can just log them to be read later, or better yet, if it can be configured to send ALL outbound mail ...
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4answers
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Sendmail is not sending

I have a sendmail server on a Solaris 10 server that's stopped working. I can't seem to find anything about failed messages in /var/adm/sendmail. Here's what I'm seeing when I try to debug: ...
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1answer
6k views

How to solve authentication error in sendmail relay through gmail [closed]

I followed the steps in http://www.linuxha.com/other/sendmail/gmail.html to setup gmail in send mail. But when I try to send mail I got the authentication failure message. —– Transcript of session ...
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239 views

postfix remote received header

I have two servers SERVER -1 (S1) and SERVER -2 (S2)(Based on centos 5 + Postfix). S1 contains my software and S2 is a SMTP. S1 submits mails to S2 and S2 mails to REMOTE STMP. Received mail show ...
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Windows 2003 Server IIS SMTP Sending SPAM

we have a Windows 2003 Server using IIS6 for SMTP and Websites. A couple of weeks ago the server started to send out SPAM emails. I'm trying to figure out how to identify where the SPAM is coming ...
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518 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
496 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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4answers
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Exchange 2007 server send out spam

Our exchange server is sending out spam, as it has been listed on various spam blacklist and not to sure know how to stop it. I've started with verify SMTP with a site like ...
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1answer
592 views

IIS Virtual SMTP to use the secondary IP when sending email

My hoster have assigned to my server a secondary IP adresse. For example, my primary IP adress is 174.10.10.1 and my secondary IP adress is 174.10.10.2. My donmain name "example.com" is binded to the ...
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1answer
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Can I receive mail at another port like 465 instead of default 25 on my mail server?

My Zimbra mail server, which uses Postfix, is working fine. I am able to receive mail at 25 from Yahoo, Hotmail etc., but if I block my 25 port for incoming then mail will stop to come into my mail ...
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3answers
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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 ...