The problem I have is so simple yet difficult for me to resolve. My Postfix MTA allow fake mails from me@example.com to me@example.com. How can I block them?
For example, if I do "telnet smtp.mail.yahoo.it 25", as I write the MAIL FROM command I get the alert "Authentication required". How can I achieve that?
Could anyone point me to some simple articles that explain what email encryption is and how to set up a mail server (e.g. Exim) that can send secure emails? I know nothing about networks, mail servers, encryption, etc., but I have to be an expert on it before I walk into work tomorrow morning.
View 14 Replies View RelatedI'm running a desktop-less version of Debian via Sun VirtualBox. The reason I'm doing this is because I don't have enough graphics or RAM power to have a desktop environment running on top of my current desktop; also, I want to learn Linux through the command prompt. I'm running the AMD64 version of Debian; I'm not sure if that's relevant.
My main goal is to be able to email useful files from the virtual Debian to my main computer, so that I can save them for later if I ever decide to do a "real" installation of Debian on this computer. I realize now that there's probably some "easy" way to do this by reading the virtual machine's hard drive, but at this point, my curiosity wants to see this issue resolved. I started off wanting to find a command-line program to send my email with, and one was built-in. The syntax ~$ sudo mail -s "Subject" email@yahoo.com "This is a test email."
C^D
Cc:C^D ~$
is what I found. I tried it, and (unsurprisingly), it failed. I then learned that the mail command calls exim4, or something along those lines, so I needed to configure exim4. Soon thereafter, I learned that Yahoo's SMTP wasn't public, but Google's was. So, I found this web page which described how to configure exim4 to allow for email to be sent to a Gmail account. I made one, and followed the page word-for-word.
I sudo-mailled a test email to my Gmail account, and nothing happened. I waited a bit longer, and still, nothing happened. Finally, I started looking around, and found out about the exim4 logs in /var/log/exim4. In my mainlog, I think that it's telling me that Google denied my connection: <date><time><random numbers and letters> == **********.gmail.com R=send_via_gmail t=gmail_smtp defer (111): Connection refused
So, now, I'm just stuck. I don't know what I did wrong, I checked my exim4.conf.template twice for spelling errors, but I don't think I made any. At this point, I can only hope that someone else has had a similar problem, or knows what I'm doing wrong (or haven't done yet).
what do I need to change in postfix/ dns to send email to one one of the email server hosted by 1and1.
I'm using zenoss to monitor system/ network and devices. I wanted to setup email notification , so I installed postfix. All works fine when I use my private account on yahoo or hotmail. but when I specify email account that is hosted by 1and1 I receive error 421. "
xxxxmyserver postfix/smtp[5399]: B0A5B22A06: to=<1and1emailaddress>, relay=mx00.1and1.co.uk[212.227.15.169]:25, delay=0.8, delays=0.04/0.02/0.62/0.12, dsn=4.0.0, status=deferred (host mx00.1and1.co.uk[212.227.15.169] said: 421 invalid sender domain 'xxxxmyserver' (misconfigured dns?) (in reply to RCPT TO command))
I happened to know my incoming and outgoing emails are being monitored by my superior. Just wondered, can i check from the mail header to find out all my emails (incoming/outgoing) are automatically being cc to another email account? We're running mail server using postfix.
View 5 Replies View RelatedI've been trying to send mail to email account even after installing postfix but am not able to do so.My distro is Centos 5.4. I followed the Centos user guide to install and configure postfix into the server,
Code:
http://wiki.centos.org/HowTos/postfix
but still didn't receive any email.
I am trying to make my elastix voip server to send and receive e-mails. It has built in Postfix mail server, and i tried to configure it.I am not sure about some parameters, such as domain and hostname.Either way, i will attach my config file and the errors that i get from log and mail queue as i get them from webmin.
View 7 Replies View RelatedLet me start off by saying I am experienced with computers, though my knowledge of Linux and networking is limited. I've just recently started setting up a Ubuntu 10.04 server to be a SMTP server. I've followed this guide by the letter: [URL] What I've attempted, to test the server, is the following:
telnet localhost 25
ehlo localhost
(this returns all the desired information) I then do a MAIL FROM my domain which is accepted, and try to do a RCPT TO an external mail server (gmail) to test sending an email. I am then told 'Relay Access Denied'. I'm sure that there's something fundamental that I'm either not understanding or not doing correctly. I simply want an SMTP server that can send to other domains. What do I need to do?
I have an OpenSuse 11.2 system that is running 2 BBS systems independently, both of which are capable of receiving smtp mail on prot 25. What I would like to do is set up Postfix on the OpenSuse OS to receive all mail for both those domains and then send the relevant mail to the correct BBS. I would therefore have Postfix listening on Port 25 External and the 2 BBS applications listening on different ports on the localhost address. At least that is the plan.
how to do this. I want to do it and still make sure Postfix is secure and not accidentally open up any nasty relay holes etc etc.
I want to test LVM+Raid. When I was testing ZFS on Solaris, I was able to create regular files, and use those as disks for testing.I tried creating a regular file full of zeros w/ dd, then partitioning that. fdisk seemed to be able to create a partition on the regular file, but mkfs and parted couldn't work with it. Is there any way to create fake block devices for testing?
View 4 Replies View RelatedI have a server with a domain running and im trying to resolve the mail server but i can't see where to start. I use OpenSuse 11.2. Basically, for starting, i want postfix to send incoming emails to a php script or perl. for outgoing emails i guess that i could use php mail function and i will see what else to have. I configured the dns. I do a dig.mydomain.tld MX and i get the following:
mydomain.tld3600INMX0 mail.mydomain.tld
mail.mydomain.tld 3600INAmyNumericalIp
So now my system is receiving MX content but i dont know what to do.
I cannot get exim4 to actually deliver any "local delivery only; not on a network".But whatever I do in the config, all mail gets frozen with entries in the log file like:"root@empty R=nonlocal: Mailing to remote domains not supported"Maybe the problem is that there is no fqdn for the computer (and will never be). How can I enable local mail delivery?
View 14 Replies View RelatedIs there a way of allowing only certain domain to send e-mails to certain specific e-mail address. I am using Sendmail, and I have an alias which translate to certain members of staff within my organization. I don't expect e-mails from outside our domain to be sent to this alias e-mail address.
View 1 Replies View RelatedI have an email setup where all of the emails from our email host is downloaded to our Linux server using Fetchmail. Then some of the incoming emails are sent to an MS exchange server (server1.domain.com) using Postfix. What i want to do is to send a copy of all emails to Another server (server2.domain.com) for redundancy.Can postfix be configured to send copies out to both?
View 1 Replies View RelatedAfter a April Fools' Day joke with fake mails (simply faked by forwarding & changing the text body) I tried to insert "real" fake mail into my online GoogleMail account. It was incredibly simple and that freaks me out a little.
I simply created the mail in Kontact, moved it to the folder I wanted it to appear in and synced - done. Someone with better knowledge might probably even manipulate the Kontact database on my computer and then sync, even changing old mails from years ago.
Is there a way to prevent this or find out that the mail wasn't really e.g. sent but just faked? I'm working at the university as a teaching assistant at the moment and from time to time you have those "No, I didn't miss the deadline, I send the mail with the paper to you" students. It was never necessary until now, but I always thought that I might check that by simply asking the student to show me his or her "Sent" folder in their online mail account. But that won't work if you can insert mails into your "Sent" folder via disconnected IMAP.
I ran this command from terminal.
Code: Select allmail -s "Test Subject" example@yahoo.com < /dev/null
Got error on command line:
Code: Select allsend-mail: Authorization failed (534 5.7.14 https://support.google.com/mail/answer/78754 ng13sm2265977pdb.82 - gsmtp)
ssmtp configuration file:
Code: Select allroot=ssmtpmailtesting@gmail.com
mailhub=smtp.gmail.com:587
#rewriteDomain=
hostname=mybox
UseSTARTTLS=YES
AuthUser=ssmtpmailtesting@gmail.com
AuthPass=[mypassword]
FromLineOverride=YES
I have a web server running and wish to get a mail server running on the same machine. I have a registered domain name. I have postfix and dovecot installed. I can send emails from the server to my normal address on a different domain but cannot receive mail. I can send and receive mail locally with no problems. I just don't know where to look for the problems. If you need any more info ( config files/doamin names etc let me know)
View 5 Replies View Relatedso i set out to change the default smtp port the server uses because my ISP blocks port 25 and i need the email to work in outlook. this morning i could receive email, but not send it. so i did some research and thought that i needed to edit the master.cf file in /etc/postfix/ by commenting out this line: smtp inet n - n - - smtpd -oand replace it with587 inet n - n - - smtpd (587 being the port i want to use)somewhere along the lines postfix server stopped running and now i cannot get it to start.if i try using SSH it crashes immediately and if i restart it in simple control panel nothing happens
View 7 Replies View RelatedI have setup a postfix mailserver and it seems to be working ok, we are only using this to relay mail to our forum users. Its not being used to recieve any email only send them out to the internet.
What is the difference between the mail.log and mail.info files? Can I turn one or both off? I see alot of messages like...
Just wondering what this string of log entries means? Also I am getting duplicates in the syslog file as well.
Two exchange servers internally. One is setup for example.com (192.168.1.10) and the other is setup for example2.com (192.168.1.20) Both are behind a single public IP.
I want to use postfix to sit in front of the two exchange servers. Postfix will accept mail for both domains and relay to the appropriate server. I have postfix installed with only defaults at this point.
I'm running SUSE linux Server version 11. I want to configure mail server with postfix & cyrus-imap. For that, i have read many documents in Internet by i met issues. I'm running DNS in this server & it's ok Now I cannont send mail through command line.
[Code]....
I set up my mail server using the guide here: [URL] I am able to receive mail, I can send mail locally, but I can't send to external addresses. This is in my mail.log: Quote: Jun 30 14:40:43 Server postfix/smtp[10725]: 2FD9322015BF: to=<myemail@gmail.com>, relay=none, delay=1634, delays=1484/0.02/150/0, dsn=4.4.1, status=deferred (connect to alt4.gmail-smtp-in.l.google.com[74.125.65.27]:25: Connection timed out)
This is my main.cf:
[Code]...
I am having problems while testing out squid proxy server. I just can't get it block anything. So, I'm running Debian lenny on my Virtualbox and Squid on it. I'm having windows 7 on virtualbox too and they can ping each other and the webserver on debian (apache2) is working fine. The problem is i can't get squid to block webpages. I have the correct settings on windows proxy settings, but i'm not so sure about squid. I want to block lets say www . xxx. com for example. So I add to the main configuration file:
[Code]...
The scenario: We have an external server that runs HTTP/DB servers for out shop system. Then, there's our local, in-house infrastructure that runs a.. yeah... Exchange 2010. The shop system on the external server needs to send mails to customers (order confirmations, invoices, etc.). seing as sending them directly through the local MTA (Postfix) would cause mail delivery problems because of reverse DNS issues, i've set the Postfix MTA to act as a satellite to our in-house Exchange Server, so the Exchange sends the mail instead, giving recipient mail servers a valid reverse DNS lookup.
Now, mails sent by the (proprietary, uneditable) shop system are relayed correctly and sent to the target e-mail address. My problem is: Mails not sent by the shop system, but by our own PHP scripts which run on that same external servers, are NOT relayed properly. So the Exchange is fine with the mails sent by the shop system, but not the mails sent by our scripts. This is what i get in the mail.log: The successfully relayed mail sent by the shop system:
[Code]....
this is my code at the moment
PHP Code: <?php
if (isset($_REQUEST['email'])) && $_REQUEST['email']!='0'{
$to = "chrisathisemail";
[code]....
I'm running a Debian LAMP server and I am adding postfix. The initial config is working and I can send and receive mail both locally and over the WAN. The problem is that I cannot get mail delivered to the user's home directory using Maildir/. I have set the:home_mailbox = Maildir/ parameter in main.cf but mail still goes to /var/mail after Postfix reload. The system is now using Maildir/ instead of mbox but in /var/mail. I really want to get mail into the user's home directory.
View 6 Replies View RelatedI try to create some rules to detect an outgoing traffic from my debian jessie that is not from my IP or loop.
#!/bin/bash
/sbin/iptables -N C_OUT_N_LOCAL
/sbin/iptables -N C_OUT_N_LOCAL_LO
/sbin/iptables -A C_OUT_N_LOCAL -m limit --limit 2/min -j LOG --log-prefix "PK: output not local : " --log-level 4
LO_IP="127.0.0.1"
MY_IP="192.168.0.4"
/sbin/iptables -I OUTPUT -p ALL ! -s $LO_IP -j C_OUT_N_LOCAL_LO
/sbin/iptables -A C_OUT_N_LOCAL_LO -p ALL ! -s $MY_IP -j C_OUT_N_LOCAL
how to unblock email with attachment .zip should be all attachment through to my email i have below message when people sent me email to my domain
Warning: This message has had one or more attachments removed
Warning: (the entire message).
Warning: Please read the "Apex-Attachment-Warning.txt" attachment(s) for more information.
This is a message from the MailScanner E-Mail Virus Protection Service The original e-mail message contained potentially dangerous content, which has been removed for your safety. The content is dangerous as it is often used to spread viruses or to gain personal or confidential information from you, such as passwords or credit card numbers.
I have currently configured Postfix as an SMTP server. I would preferably not use a domain name in my email address, like so: myname@[1.2.3.4]
I'm currently testing to see how other mail servers handle this kind of address. When I sent a mail with one one of my gmail accounts, I see that the mail gets rejected due to bad syntax.
It seems as though Google is giving me a RCPT TO address like so: myname@1.2.3.4 However, the postfix server rejects this address with the following error:
501 5.1.3 Bad recipient address syntax
To my best knowledge the only way to have an IP address inside an email address with to write it as a domain literal [1.2.3.4].
My question: how to configure postfix to accept myname@1.2.3.4 as well?
I have put both [1.2.3.4] and 1.2.3.4 in "mydestination" and 1.2.3.4 in "virtual_alias_domains".
It doesn't seem to work so far though.
I want to install a email server so my domain handles it's on email. I understand I need a dns server first. I down loaded dbndns but can not even figure out how to start it. does anyone know how to get this set up. Or where the setup files is for this.
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