General :: Postfix Giving "SMTP Server Error: 5.5.0 Sender Already Specified"
Nov 27, 2009
I'm using postfix to send some mail from my cloud server via a web page on my website that uses PHPmailer to do SMTP authentication. My cloud server has a dedicated IP for all inbound and outbound data. The problem I am having is that it sends roughly 75 - 100 messages successfully before it returns the following error for the remaining few hundred recipients in my list:
SMTP Error: The following recipients failed: example@example.com Mailer Error [URL] SMTP Error: The following recipients failed: example@example.com SMTP server error: 5.5.0 Sender already specified
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Aug 1, 2010
I got one last stop until I've fully configured my Sendmail server. I want the server to verify which address the sender is using when sending mail. Even though authenticated via SMTP AUTH or mailing from an IP listed as RELAY in access.db, the user should not be able to use whichever address he likes.
Ideally, I would like Sendmail to use a file that looks something like this: Username sername@Server.org
where, if logged in with Username, the only accepted sender address is Username@Server.org. As of now, Sendmail just verifies that the sender domain exists and then relays which I don't like. This also applies to a lot of other servers as well... for example in the cases where ISPs have blocked outgoing port 25 and let all their users use their SMTP server. I assume, if they don't use SMTP AUTH which is not the case where I am, that they have their entire IP range listed as RELAY and therefore, using my ISPs SMTP when in their net, I can send mail as whomever I like as long as the sender domain exists.
I've had a look at filters but haven't found any suitable and I assume that this might be realised through a Ruleset or something. What do you think? Have I missed something making this a really stupid suggestion or am I on to something? It would make my day
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Oct 4, 2010
so 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
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Jan 8, 2010
I want a mail server that can relay mails to the internet using GMail and fetch the mails of different accounts into the mail server and distribute them to their respective users. I am using Postfix, Fetchmail and Dovecot. I have a PC with 3 users.I use the PC having Ubuntu 9.04 and share the internet. We all send mail and retrieve mail. We do use Evolution and Mutt sometimes. We want to send our mails with our email_ids without even logging in.
Hostname
mail.myhomepc.com
Domain
myhomepc.com
[code]....
I have created my custom certificate using SSL. I've created the Postfix's main.cf file following a tutorial on the net. Currently mails are going fine, but with our local email_ids. I want Postfix to rewrite our local email_ids with the equivalent email_id on the net.
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Dec 27, 2010
I need to have a postfix server to rewrite the sender's address. For example, if the sender is: [URL], then the recipient would receive all emails from [URL] as [URL]. I tried using the generic file and created a table out of it, but this did not work:
postmap /etc/postfix/generic
-rw-r--r-- 1 root root 9977 Dec 27 15:24 generic
-rw-r--r-- 1 root root 12288 Dec 27 15:25 generic.db
I added this line to the generic text file:
[code]....
I am running two boxes with postfix 2.3.3. and 2.1.1 respectively. Both need this configuration. I also added this line:
smtp_generic_maps = hash:/etc/postfix/generic
on the main.cf file. However, this did not work. The one running postfix 2.3.3 is on Centos 5.5, the other one is on SuSe Enterprise 9.
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Dec 2, 2010
I'm hoping someone here can help, as I've been beating my head on the wall for a week now with little advancement. I've found a number of tutorials on setting this up, however none of them have gotten me 100% of the way there. Here's my situation: home-based Fedora server (Core 8), running sendmail 8.14.2-1. Connecting to hosting company's smtp server over port 587, to bypass Verizon's blocking of port 25.
My /etc/mail/sendmail.mc file looks like this (comment lines removed):Quote:
divert(-1)dnl
define(`SMART_HOST', `smtp2.datarealm.com')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 PLAIN')dnl
FEATURE(`authinfo',`hash -o /etc/mail/auth/client-info.db')dnl
define(`RELAY_MAILER', `esmtp')dnl
[Code]....
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Jun 17, 2010
Im trying to get postfix to filter my outgoing mail and basically drop everything that is not in my hash table.
So far I managed to get this going
Code:
Code:
Unfortunately those rules also apply to incoming messages. My goal is to disallow users on my host to change their "MAIL FROM" to anything they like and restrict them to domains I specify. I'm aware that the local part still is variable and a user of domain "foo.com" could use a email of domain "bar.com", but still some of my troubles would be solved if I get this running.
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Aug 22, 2009
This seems like a relatively simple question, but I haven't been able to figure it out from the documentation after a couple of hours of searching. I'm running postfix on my mail server, and the vast majority of my spam has the sender address spoofed to match the recipient address. I've got spamassassin up and running, and very little gets through that, so it's not a serious problem, but if possible I would like to be able to reject the mail before it arrives to reduce the system load.
Mail is sent locally via webmail, relaying is denied, so the only way that mail should be sent from the domain is via a connection from localhost. The basic idea I'm thinking of is if the MAIL FROM sender claims to be an address at the receiving domain, but is connected from a remote IP, the mail should be rejected.
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Apr 14, 2010
I am trying unsuccessfully to have a more permanent fix so I can receive emails from an invalid domain. The message is 'Sender address rejected: Domain not found' in the postfix mail logs. Fair enough, there may be an A record or MX record problem there, but there is nothing I can do about this with the Sender at present. Mail *will* come through from the invalid domain if I delete
Code:
reject_unknown_sender_domain
from the list at: smtpd_recipient_restrictions in /etc/postfix/main.cf (see coded area below for full list). I have added the Domain in question as an 'OK', both by name and by IP address, to: /etc/postfix/recipient_access, then used postmap to successfully create the database which appears as: recipient_access.db
ie recipient_access (not recipient_access.db) has contents: invalid-domain-name.com OK ; the space betw is a tab space 123.456.789.012OK ; the space betw is a tab space I suspect the failure is something to do with postmap and the recipient_access.db database file created by postmap, but just cannot work this out. Running: postconf -d indicates that the hash format is the default database format
As indicated below,
Code:
check_recipient_access hash:/etc/postfix/recipient_access is listed up front in smtpd_recipient_restrictions Postfix was restarted on all occassions Everything above was done as root and permissions on the .db files are the same as other files in /etc/postfix
From /etc/postfix/main.cf:
Code:
smtpd_sasl_auth_enable=yes
smtpd_helo_required = yes
disable_vrfy_command = yes
[code]....
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Nov 26, 2010
my postfix to send and recive external emails, but many recive in trash folder.Other programer say me that is need some configurations in postfix with and dovecot to work, but i dont know what!This is my first time configuring a linux server at this week.
my main.conf
sample_directory = /usr/share/doc/postfix-2.3.3/samples
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
[code]...
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Jun 9, 2011
I have postfix relaying email to the internet for my LAN I need to configure postfix to trust only one SMTP server to relay his emails to the internet
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Jul 27, 2009
I have a linux box on my DMZ with postfix on it. I have exchange on our internal LAN on 10.152.0.104.
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Oct 27, 2010
I have the following config with Postfix:
Quote:
But it keeps coming up with:
Quote:
Is there any reason from these configs as to why this should be occuring?
This was the guided step by step tutorial I followed: [url]
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Jun 24, 2011
I've got an uber simple test mail script in php on my awesome new dev machine running Ubuntu:
PHP Code:
Unfortunately, something is preventing mail delivery. I can't tell from this error log whether it's the remote machine rejecting me or whether it's my machine rejecting the self-signed cert on the remote machine:
Code:
I'm wondering what I could change in my postfix configuration to remedy this problem.
I tried setting smtp_tls_security_level = may = may but this did not change anything.
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Sep 20, 2010
I have searched through piles of postfix and sendmail documentation but I'm not sure of the terminology to describe what I want to do so I'm never sure what solutions are workable. Null client, relay hosts. What I have already is a RHEL postfix server which sends and receives email. What I want to do is add a second postfix server to the network. The second server should accept only ssl smtp mail and forward it on to the main postfix server. Users shouldn't use it for normal internal sending/receiving. It's only to allow me to support ssl smtp from people working out of the office without messing about with the main postfix server. I thought a Null Client sounded likely but I don't think it will accept mail. Is it a relay host I'm trying to configure? Any pointers on configuring something to just accept secure smtp and forward?
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Dec 13, 2010
I am using the Postfix SMTP server for sending emails. However I just did a default installation and subsequently someone is sending spam using my SMTP server. I would like some help on securing my Postfix server and to block these mischievous emails being sent from my server.
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Mar 15, 2010
I am looking at setting up a multiple postfix SMTP servers for a single domain. Below is my requirement, I would appreciate if someone out there could guide me to achieve this using postfix..
1. Want to setup 2 postfix SMTP Server with 1 POP3 Server.
2. Server1 will host POP3 & SMTP services for domain "metallica.one".(IP: 1.1.1.1, MX: mx1.metallica.one)
3. Server2 will host only SMTP services for domain "metallica.one" (IP: 1.1.1.2, MX: mx2.metallica.one)
4. Server1 & Server2 will be used as load balancing for sending mails. (either manual settings in email client, or auto-loadbalancing is still preferred).
5. Mail received for domain metallica.one on Server2 should be pushed/forwarded/relayed to Server1 where POP3 services are running.
6. Outgoing mails for other domains from Server2 should be sent directly to the other-domain-recipients without relaying to Server1.
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Apr 10, 2010
I'm trying to configure Postfix with a mail server that I programmed in C. The main.cf is set in this way :
Code:
relayhost = [myMailServer.localhost]
smtp_sasl_auth_enable = no
smtp_use_tls = no
disable_dns_lookups=yes
smtp_never_send_ehlo = yes
code....
I don't know why it doesn't receive response after HELO. In fact if I debug my mail server with gdb, I can see it sends a 250 response code. Moreover, I've tested my server both with traditional mail clients, as Thunderbird, and through telnet session and it works very well.
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Oct 23, 2010
Try as I might I cant get postfix to send emails through an external email server (I can succesfully get client software to do it no trouble) After following the howto at:
[code]....
I get 5.0.0 errors re:
Code:
May 6 16:06:32 SERVER1 postfix/error[20357]: 2392F21438: to=<SOME_ADDRESS@hotmail.com>, relay=none, delay=0.17, delays=0.1/0.01/0/0.06, dsn=5.0.0, status=bounced (smtp.live.com)
Here's my main.cf
Code:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
[code]...
I get basically the same error no matter what smtpserver/username/password combination I use leading me to believe its my setup and not my username/password
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Feb 11, 2011
I'm trying to set up my postfix server to relay mail (via a php cms) using Gmail's smtp on my account, but for some reason, Gmail returns an error code that StartTLS must be sent first, my postfix main.cnf file can be found at pastebin, because of this forum's text length I cannot paste my postfix main.cnf file as can be seen I have everything set and configured for Gmail, but postfix (for some unseen reason) can not send StartTLS. [URL].
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May 5, 2010
Try as I might I cant get postfix to send emails through an external email server (I can succesfully get client software to do it no trouble) After following the howto at: [URL] I get 5.0.0 errors re:
Code:
May 6 16:06:32 SERVER1 postfix/error[20357]: 2392F21438: to=<SOME_ADDRESS@hotmail.com>, relay=none, delay=0.17, delays=0.1/0.01/0/0.06, dsn=5.0.0, status=bounced (smtp.live.com)
Here's my main.cf
Code:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
[Code]....
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May 25, 2010
I'm trying to set up a basic smtp server on my local computer that I can send basic, unencrypted email through on port 25. I installed postfix, and I chose the following options:
Internet Site,
System Mail Name: localhost
Root and postmaster mail recipient: I left this blank
For other domains to accept mail, I entered : NONE, localhost
No force synchronous mail updates
Local networks: 127.0.0.0/8
[Code].....
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Feb 26, 2010
I followed this How To (https://help.ubuntu.com/community/Postfix) in order to add smtp authentication to my Postfix installation used as spam filter for my exhange server, and it'seem all ok; the only thing that I don't understand is where I list all the users (with passwords) that I authorize to send mail through my server...
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Feb 11, 2011
After configuring sendmail in Linux I am able to send a mail once only. After that whenever I try to send a mail like this:
telnet localhost.url 25
EHLO localhost.url
MAIL To: susan@url
RCPT To: harry@localhost.url
MAIL DATA
after that whenever I press enter it gives me an error :
Sender Already Specified 503.5.2
Can anyone tell me why it gives this error and how can I remove this error by doing changes in which file and how?
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Jan 2, 2010
This is a transcript I get emailed at least once every day, usually about 3 to 10 a day recently.
Transcript of session follows.
SMTP server: errors from unknown[ip address]
<boring stuff snipped>
In: RCPT TO: <server@my domain>
Out: 550 5.1.1 <server@my domain>: Recipient address rejected: User unknown in local recipient table
Session aborted, reason: lost connection Now I cannot seem to find anything via Google, as when I put "server@" anywhere in the string, I just get web hosting or other kroomst. The emails usually come from legit places, usually hotels. Does this mean they are sending bad emails, i.e. they have a Trojan/worm, or is this a live hack attempt?. I believe the later, as I might get upto 3 domains from the one ip address, which is always, NOT associated with the listed domain. Not causing me any issues, except I have been getting a lot recently.
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Feb 22, 2010
block incoming email within either postfix or spamassassin when the sender equals the recipient. The manner in which our mail infrastructure is set up would preclude this from happening. Granted, we do have outside vendors that spoof our domain so we have to allow emails in with our domain as the sender/from. The vendors do not, however, utilize the same sender/recipient when sending emails.
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May 21, 2009
I have an email server configured with postfix, dovecot, saslauthd and squirrelmail. It works great. In fact I'd even say it works too well: in squirrelmail, I can configure any sender address and my server will accept it. Message will be sent, wether the sender's address is [URL] or [URL]. Is there any way of limiting it in such way that only [URL] is accepted as sender's address?
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Dec 17, 2010
I have setup up an Opensuse as a simple we/application server.It handles requests for various things and will need to send out email on occasion for things like password reset requests, information / warnings etc. etc.This is a standard OPenSuse 11.x install with defaults so it comes with Postfix as the mta.I do not want a mail server I just want to send out via my clients mail server which is hosted exchange rackspace, which simply requires SMTP auth to do so.What would be the proper way to do this so ALL e-mail send from this machine, regardless of account like WWWRun or when logged in and sending from the command line has the same sender all the time.
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Jul 8, 2011
I'm looking for a way to redirect e-mail with postfix based on sender AND recipient. What I want: Let's say I have 3 users:
[code]....
and an external address, let`s call it [URL] sends e-mails every day to andy, mark and john Now, MARK and JOHN, need the e-mail sent by [URL], but TOM doesn't need it. Is there a way to redirect ONLY the e-mail sent to TOM from [URL], to some other address, let`s say [URL] without affecting the e-mail received by MARK and JOHN? Unfortunately using SENDER ACCESS redirects ALL e-mail from [URL]
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Feb 8, 2010
I've set up an email server as per this howto: [url]
In a nutshell, it uses a combinatio of postfix, dovecot, amavis (ClamAV and SpamAssisan) and mysql.
However, with this setup, authenticated users are able to spoof outgoing message by simple changing the "from" tag.
Does anyone have any ideas on how I could implement some address mapping to users?
In this setup, postfix users are NOT system users, by are stored in the database.
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