SMTP is a protocol built upon TCP/IP, used for outgoing email transmissions, and email relaying. It uses ports 25 (clear) and 465 (SSL) by default.

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Question about MX records and mail delivery?

Let's say, we have multiple mail servers in DNS records. If someone is sending a mail, the outgoing mail server will check the MX and contact the first server with the lowest cost. If this server ...
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1answer
49 views

How to disable SMTP Auth Plain for James-2.3.2. on Slackware 14.0?

I am trying to disable SMTP Auth plain for James-2.3.2 on Slackware 14.0. Has anyone successfully done this without changing the source code?
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115 views

How to disable SMTP auth plain for Citadel 8.20 on Slackware 14.0?

How do I turn off SMTP AUTH PLAIN for Citadel 8.20 on Slackware 14.0? If I set up postfix to handle SMTP would this allow me to not have SMTP auth plain enabled
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1answer
625 views

SMTP/POP server only for internal e-mails on hosted domain

We have a domain for a web site and e-mail that's hosted off-site. (We don't have a reliable enough connection to host it ourselves.) Our shared host sometimes has SMTP problems, but never POP ...
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1answer
779 views

Can't send mail with sendmail

I use SENDMAIL, I noticed that none of my mail is sent. I have all my mail in the /var/spool/mqueue when I looked at the log and I have this error MDeferred: Connection refused by ...
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1answer
282 views

Catch all emails and save them in MySQL

I want to do something like Facebook has with it message system. When you reply to email sent from Facebook User, it automatically gets in his message box. This is done, because you reply to ...
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2answers
181 views

Considerations when hosting an outgoing email server

I want to host an email server on my VPS so I can send automated emails from my application. Reading about the different ways of hosting email servers (involving ISPs blocking ports, open relay ...
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1answer
550 views

mails being marked as spam

I configured my own mail server using sendmail for our application . Mail server is used to send automated mails when a user registers at our site . I was able to implement this successfully, but ...
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0answers
2k views

SMTP Issue: did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

We had a urgent requirement for creating a mail server to send mail for our Portal application using Liferay. The mail account will be an administrative account to maintain the portal. I was able to ...
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3answers
4k views

What is the equivalent of telnet localhost 25 with ssh?

What is the equivalent of telnet localhost 25 using SSH ? Clarification : I would like to have an SMTP connection with a server using SSH, just like it can be done with a command like telnet ...
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1answer
2k views

Postfix: 554 5.7.1 Relay Access Denied

My Problem is this: I can send E-Mails from my E-Mail (evolutio@lars-dev.de) to my other Emails like @gmail @web @gmx ... But when I try to send a E-Mail from GMail to evolutio@lars-dev.de I have the ...
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3answers
13k views

How to “close” open ports?

A few days ago I started to care a lot about my data security, I end up nmaping myself with: nmap 127.0.0.1 Surprise, surprise, I have lots of active services listen to localhost: $ nmap 127.0.0.1 ...
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1answer
397 views

OpenSMTPD Configuration Problem

I'm trying to configure a simple mail server on OpenBSD 5.2, running OpenSMTPD 5.3.1, however there is some problem with my configuration file, and I'm unsure how to fix it. I can send and receive ...
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1answer
997 views

SMTP connectivity issue in Zenoss (“Connection unexpectedly closed”)

I am using Zenoss for monitoring purpose. I have been using its mail service for a long time. Suddenly my mail service in zenoss stopped and started showing <class ...
2
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1answer
2k views

mutt SMTP TLS error sending mail

When I try to send a mail, I get the following error: gnutls_handshake: An unexpected TLS packet was received. This is my .muttrc (myname, myaddress and mymail are placeholders): # Automatically ...
2
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1answer
417 views

Trouble with postfix install (timing out from client) [closed]

I have just outfitted a basic server (Ubuntu 12.04 LTS /Precise Pangolin) and have installed Postfix and Dovecot, based on the Ubuntu manuals. https://help.ubuntu.com/community/Dovecot ...
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2answers
2k views

Check SMTP server capabilities on the command line

I know an SMTP server's URL. I want to know about that SMTP server's capabilities: TLS, password encryption, etc. Evolution Mail knows how to report these. How can I get them from the command line? ...
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2answers
844 views

Recommendations for good MTA / groupware solutions?

I'm setting up a Debian server, and one of the things I need on it is an MTA. I don't want to use something like Exim or Postfix because I want something that ties in SMTP, POP3, and IMAP all in one ...
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1answer
342 views

How can I configure postfix smtp per user?

I have previously used msmtp as my MDA. msmtp has a configuration file with username and password of the outgoing smtp server (eg gmail) stored in my home directory. I've recently changed ...
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1answer
134 views

How to limit the number of messages sent through a mail server?

I am running a small server on a LAN and do not expect more than a couple dozen emails an hour or so. A user on the LAN accidentally set off a few thousand emails at once. Is there a tool or setting ...
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1answer
4k views

How to change SMTP outgoing port on Centos 6.3

I have a dedicated server running Centos 6.3. My customer wants to use Microsoft Outlook to send and receive e-mails. He can connect and receive his mails but when he tries to send e-mail he can't ...
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votes
2answers
2k views

Protecting postfix from bruteforce attacks

a few days ago I've set up a VPS, including personal SMTP service using postfix + procmail under Debian / Wheezy. I am already seeing a LOT of hammering onto the SMTP and other ports. Here's an ...
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1answer
361 views

How are email headers generated?

When you send an email a header is part of the message. For example, when you check your mail you can view the raw source and see the headers, which has information about the sender of email in it, ...
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2answers
488 views

Lightest weight SMTP server for Linux Single Board Computer (SBC)

The other discussions I found did not give a clear answer to my question. Problem description: I am running an embedded Linux server device, such as TuxRail or a DreamPlug which are ARM-based devices ...
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1answer
671 views

Exim4 as smarthost with SSL?

I want to use exim4 as a smarthost to send email using an smtp mail account over ssl. I've seen the hosts_require_tls option, but I need SSL and not TLS. How should I do this?
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2answers
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Too many smtpd daemon forks?

I have many forks from smtpd in my process list on my webserver. What does this mean? Is my mailbox full? postfix 2662 0.0 0.9 106336 4856 ? S 17:37 0:00 smtpd -n smtp -t ...
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0answers
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SMTP Auth - SASL on Dovecot, Postfix and CentOS 6.2 (and Open-Xchange)

I am trying to get open SASL to work on CentOS 6.2. I followed this tutorial: http://wiki.centos.org/HowTos/postfix_sasl I suspect it works perfectly for CentOS 5.x so all I really need is an update ...
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0answers
197 views

fetchmail to log complete messages AND pass to mda

I couldn't seem to tell from the fetchmail man page or http://www.catb.org/~esr/fetchmail/fetchmail-man.html#7 whether --bsmtp <filename>.bsmtp.log, applied from cli/cronjob, and --mda ...
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0answers
348 views

Sendmail configuration with user mapping on Solaris

I have the following: host1.intra.net which has sendmail and users: user1, user2 & user3. It is running SunOS 5.10. host2.intra.net which has SMTP server. No authentication, no encryption. Email ...
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4answers
52k views

Can I set up system mail to use an external SMTP server?

Is it possible to set up system mail on a linux box to be sent via a different smtp server - maybe even with authentication? If so, how do I do this? If that's unclear, let give an example. If I'm at ...
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1answer
769 views

msmtp alternative that understands /etc/aliases

I'm looking for a simple smtp daemon, that supports aliases (due to issues with daemons, that refuse to send emails to anyone else than root). If you don't know msmtp, then basically, I just want to ...
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1answer
45 views

Setting up a mail server to simply be able to see emails sent

I'm writing an application right now that simply sends emails. All I'd like to be able to do is see clearly that my application is, in fact, sending email and that I'm getting the included attachment. ...
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1answer
336 views

php mail not working in rhel server?

I have installed roundcube mail and when it tried to use installer which uses php mail it is loading for 5 to 10 minutes and then telling me 'ok' but no mail comes to me. smtp_port is 25 host is ...
2
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2answers
729 views

Is there a way to completely disable outbound opportunistic TLS support in SendMail?

CentOS 5.x SendMail 8.14.4 An overzealous network security feature is causing TLS negotiations to fail when my Sendmail server tries to talk to external hosts. This is causing sendmail to constantly ...
3
votes
1answer
2k views

How do I email root?

I am on Debian squeeze and I'd like to forward my root emails to my real email. I setup exim to use gmail so when I write mail myname@myemail.com it sends to my email. However, now I'd like to email ...
3
votes
2answers
685 views

sendmail not sending to the cloud (local mail works)

I'm using a perl module (Mail::Sendmail) which uses sendmail to send stuff. It hasn't been working, but hasn't been giving me any errors. So now I suspect sendmail. I tried: telnet 127.0.0.1 25 mail ...
3
votes
1answer
647 views

How to send non-local mail, with GMail(GApps) SMTP?

I have some (~3) Debian boxes, and I want to post system mail to my non-local mailbox. But I have a problem with configuring exim4. Also I don't like so much exim4's config. Too different, and also ...
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vote
1answer
193 views

Postfix: Can I configure it to *not* include original email on undeliverable?

The question's title says it all. Scenario: The Postfix server is used only for mail-relay; in the office back-end, we use hMailServer. Some hMailServer users have their emails auto-forwarded to ...
2
votes
2answers
1k views

setting up mail system

So I'm still kind of new to linux, but what are the steps towards setting a linux box up in such a way that it can send mail using shell? echo "hello world" | mail johnny@moo.com I mean, I've done ...
2
votes
4answers
589 views

ssh public keys instead of SASL for authenticated SMTP sending?

I'm currently using postfix and SASL on my personal server for authenticated SMTP. The server is purely for my personal use and my personal domains, so I'd much rather have something simpler based on ...
2
votes
2answers
1k views

How to send mail from a remote SMTP host?

I have Postfix suite installed locally on Ubuntu 10.10. I can send/receive mail to my local address, e.g. user@local.com. I'm given credentials to a remote mail server mailbox, e.g. ...
5
votes
1answer
1k views

Changing SMTP authentication in mutt based on From e-mail address

I use mutt as my e-mail reader, and nbSMTP as my SMTP client. I check e-mail from a half dozen accounts and sort them into miscellaneous folders in my maildir. Some of the folders are ...
21
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6answers
19k views

Lightweight outgoing SMTP server

What do you use as a lightweight SMTP for outgoing e-mails only? I am running an app that sends e-mails via SMTP when events occur once in a while, and I don't need a fully featured e-mail server. ...