Free and open source mail transfer agent (MTA) that routes and delivers email. When asking about postfix problem, please include the relevant maillog lines and output of the following command: "postconf -n" (content of main.cf) and/or "postconf -M" (content of master.cf)

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-1
votes
1answer
270 views

postfix unable to receive external emails

I have setup an email server with postfix and dovecot. Installation went fine but I am not able to receive emails from external users(gmail, yahoo etc) but I can send email to external users. When an ...
0
votes
1answer
17 views

Postfix with dovecot unable to deliver message

I'm trying to setup a mail service on my server with this and this articles. After finishing configuration, i got working user accounts - its possible to successfully login on each account with ...
0
votes
0answers
12 views

Postfix: on multi-recipient e-mails of same domain, how do you remove all but one (first) address?

We have a shared IMAP mailbox for a business. Customers are not used to not having to CC tons of people with us, so they CC everybody, which creates noisy duplicates in our shared inbox. How can I ...
2
votes
2answers
2k views

What's wrong with my postfix setup routing through Amazon/SES? (smtp_sender_dependent_authentication)

I'm trying to use Amazon SES as an SMTP gateway for my EC2 Ubuntu 'precise' server, using different SES accounts for different originating e-mail domains. The postfix documentation seems to imply that ...
0
votes
0answers
24 views

Spamassassin always says ALL_TRUSTED

So I've got a mail relay (Postfix/amavis/SpamAssassin) running that seems far too lenient on spam and I'm trying to diagnose why. Some background: we provide internet service to hotels and similar ...
0
votes
1answer
27 views

How can I strip or rewrite the sender's name of a from address when using postfix?

Objective I'm trying to configure a CentOS 7 system so all mail sent to local system accounts gets redirected to an alternate email address. For example, if mail is sent to root I want it to be ...
3
votes
1answer
39 views

Foreign mail server returns “502 Command not implemented.”

I am using Postfix to communicate with foreign server and send a mail. Every time when I try send mail using Postfix, I get this error: (host mx2.seznam.cz[77.75.76.32] said: 451 Local Error (in ...
2
votes
2answers
1k views

Postfix - Dovecot - Can Send Emails But Wont Receive - NOQUEUE - Relay Access Denied

I have set up a mail server on ubuntu. Ive checked ports are open and I've double checked all config files, checking with every google search result I could find. Most of the similar posts have more ...
2
votes
3answers
195 views

What is the sendEmail equivalent on CentOS 7?

I am trying to follow the steps below. But there is no sendEmail on CentOS 7. I have looked at a few alternatives like Postfix, but I am not sure of the script commands. Alternatively you can use ...
1
vote
1answer
40 views

Postfix acting like an open relay for domain mailboxes

I have a mail server running on Debian 7.8 configured with postfix 2.9.6. My restrictions are these: smtpd_sender_restrictions = reject_sender_login_mismatch, reject_unknown_sender_domain, ...
1
vote
0answers
42 views

Postfix / Relay Access Denied on mail server host [duplicate]

I checked the different answers on google and on this site about this kind of issue, but couldn't find any matching ones. I just can't send email from local (webmail) or from external mail clients to ...
-1
votes
2answers
63 views

Reject email if “rcpt to” does not match relay_domain - Postfix

My mail server currently shows up in mxtoolbox as Open Relay. Objective: Allow SMTP connection only when RCPT TO: says example.com What changes should I make in it so that, it would reject the ...
1
vote
1answer
26 views

Update of SpamAssassin

We're running SA as a filter to Postfix and just completed an update (of SA) from 3.3.2 to 3.4.1. The spamassassin, spamd, and spamc executables have all been verified as the newer version. ...
0
votes
2answers
234 views

postfix: set from address when relaying to google mail

I use postfix on a debian server and I have it configured to use gmail as a smarthost (hope I've got that right). How can I set the From: address on my outgoing mails? I need to change that on every ...
-1
votes
1answer
54 views

setup postfix SMTP on amazon ec2 [on hold]

Im trying to setup a postfix SMTP mail server on my amazon ec2 instance. I followed this guide http://cybart.com/how-to-install-and-configure-postfix-on-amazon-ec2/ and many others I found which ...
-3
votes
0answers
26 views

vestacp external DKIM key records not working [on hold]

For testing purpose i hosted one of my domain on vestacp and configured mail server on another server, i use opendkim for outgoing mail signing on mail server and the public key added in vestacp DNS ...
1
vote
1answer
69 views

Postfix: 'Relay access denied' - all incoming mail is rejected

I am testing my PostFix setup by sending email from my gmail account to an account on a virtual domain. Postfix's response is invariably: NOQUEUE: reject: RCPT from ...
3
votes
1answer
48 views

Postfix: Fall back on SMTP relay that has internet access

I have a scenario where I have: Postfix server M (Stores mail) Postfix Server A (Relays mail using internet connection IA) Postfix Server B (Relays mail using internet connection IB) Internal DNS ...
1
vote
3answers
272 views

Is postfix the only program that should be using port 25

My server IP was blacklisted for sending out spam and I am tracking down the program sending spam. I did netstat, and it shows a lot of programs using port 25 e.g tcp 0 182 ...
-6
votes
1answer
41 views

Why use both Dovecot and Postfix? [duplicate]

Just out of curiosity, there are dozens / hundreds of tutorials helping you setup a Dovecot - Postfix mail server. On the surface, both of them are email servers, why use both? Mail servers are ...
1
vote
0answers
47 views

Dovecot doesn't fetch mail from Postfix

I have installed Postfix on remote machine that successfully sends emails as well as receives. In order to connect to that remote server through email client (Thunderbird) I have installed Dovecot. ...
1
vote
0answers
23 views

SASL Auth against LDAP

So I am running into a whirlwind of issues with my cyrus install. I am setting up a multi-domain kolab groupware solution. I am on centos 6.7 I am getting this flooding my error logs when I try to ...
4
votes
1answer
46 views

Creating a postfix alias “all@domain.tld” to send to all users of a domain

I'm using Postfix + Dovecot with a MySQL database as backend and PostfixAdmin to administrate users and domains. Now I'm looking for an easy and automated approach to define per-domain alias of the ...
0
votes
0answers
27 views

How do i setup my server so that gmail does not mark it as spam [duplicate]

I have setup my domain mydomain.co.za and put an spf record to my server ip, example 123.456.789.123 when i send an email to google my postfix log shows Aug 24 20:39:25 myname postfix/smtp[21855]: ...
2
votes
1answer
52 views

Postfix - sender dependent relaying for multiple domains

I have spent the last couple of days going through SO questions and the Postfix documentation but have not succeeded in figuring out what I'm doing wrong. My situation is as follows: I have a server ...
0
votes
1answer
47 views

postfix/qmgr[…]: warning: connect to transport private/[myhostname]: No such file or directory

If I send an email from my client to an other person, the following I found with systemctl status -l postfix: postfix[20012]: Starting Postfix Mail Transport Agent: postfix. postfix/master[20119]: ...
-3
votes
1answer
26 views

Postfix setup issue

I'm trying to allow an external server to use my webserver (running postfix) to relay email through. I've gone through several articles on setting up iptables and I think I have it, but I still can't ...
1
vote
2answers
34 views

How do you configure postfix to only try unencrypted email with a fix list of IP address/domains?

A PCI scan told me to stop using TLS 1.0 for e-mail. I'm using postfix, so I disabled TLS 1.0, and all traffic for 1.0 stopped. Then the next day I looked at the logs and I see a lot of this... ...
0
votes
1answer
38 views

PFsense postfix troubleshooting - SMTP headers [closed]

I am trying to setup google as mail relay but running into some troubles. I get an error that 550-5.1.1 The email account that you tried to reach does not exist My custom main in pfsense looks ...
0
votes
4answers
2k views

Bugzilla not sending emails, even to the test file?

I have installed and setup Bugzilla3 for my domain. Everything is working properly except for the email functionality. The server uses Postfix, and that works for my PHP application, and command ...
1
vote
1answer
46 views

Dovecot: virtual and local users homonyms: Mail access for users with UID 1000 not permitted

Well, the case seems simple but I can’t find a satisfactory answer. I have a Postfix/Dovecot installation with the later configured to work with virtual emails which works like a charm... for ...
1
vote
4answers
3k views

Postfix - How to write outgoing mail to harddrive (not internet)?

In order for my webb-app unit tests to work in my local development environment, namely where email delivery is concerned, I installed postfix. Come to find out my co-workers are now getting numerous ...
-6
votes
1answer
50 views

Postfix not recieving mail from Gmail

I've Installed Postfix with Dovecot on CentOS 7. Everything is working good when I try to send / recieve emails from services like Outlook.. etc. However, there is a problem when I send an email from ...
-1
votes
0answers
20 views

How to configure Postfix to relay mails to remote Mailman server?

I want to setup a postfix server a.example.com on one physical maschine and a postfix/mailman server b.example.com on another maschine. All mail is received by server a.example.com and has to be ...
-1
votes
1answer
58 views

Block outgoing emails from Postfix from non-existent users

I'm getting spam sent through my server. The sender names are always random, but always in the form randomname@mydomain.com. I've tried adding reject_unlisted_senders to the ...
-1
votes
0answers
27 views

Postfix: Redirect bounced emails to dynamically extracted email address

I have postfix (via iRedmail) and I want it to check bounced emails and extract an specific header X-FWD-EMAIL: email@domain.com (if there is any) and forward it to the specified email address ...
2
votes
1answer
51 views

postfix: relay access denied. How to fix it?

I've been fiddling with main.cf file for a long time but still couldn't find why. I've set up an email server with this tutorial Email with Postfix, Dovecot and MariaDB on CentOS 7 This is the part ...
2
votes
1answer
30 views

Integrating postfix with LDAP to eMail Users with Access to A Specific Host

I have a working openLDAP v3 installation under Ubuntu 14.04 (slapd 2.4.31-1) with phpldapadmin, sudo-ldap and other packages installed. I'm trying to integrate postfix with LDAP so I can send emails ...
1
vote
1answer
34 views

POSTFIX only receive email if server hostname is included in email address

I have this situation: postix/sasl/dovecot I recently added dovecot and sasl and i can only receive email to postfix if i use this email format: user@serverhostname.domain.com If i use desired ...
0
votes
3answers
4k views

Postfix isn't running but won't start because “the Postfix mail system is already running”

I have a server that I'm restoring from backup. It's quite possible that someone rsync'ed the root FS somewhere. So don't expect this to be in a healthy or sane state. When I try to start postfix, it ...
1
vote
0answers
189 views

Mail marked as spam (Gmail/Hotmail): IP not on blacklist, DKIM Valid, SPF Valid and DMARC valid

I'm trying to send mail from my own domain (which is 15 days old now) but I'm having some troubles. Check the following mail body: Delivered-To: ------@gmail.com Received: by 10.25.89.200 with SMTP ...
1
vote
1answer
48 views

What is the best way to harden a postfix null client on an exploited php webserver?

We use postfix as a null client to send out mail from a php webserver via sendmail. We host our incoming mail servers elsewhere and use a SPF record to authorise the server to send emails from our ...
1
vote
1answer
25 views

Migrating from old mail seerver to new, error “Sender address rejected: User unknown in virtual mailbox table” [closed]

I'm trying to migrate a domain from an old mail server to iRedMail, anyway I think the topic is more broadly Postfix specific. I have set up a new server based on iredmail and then I will migrate all ...
-1
votes
1answer
53 views

SSL Certificate - Self-Signed Certificate

I'm trying to get PCI compliant and the PCI scanning company is showing below Fail scan report SL Certificate - Self-Signed Certificate SSL Certificate - Self-Signed Certificate port 25/tcp over ...
1
vote
1answer
67 views

Postfix + Dovecot with MySQL backend: md5-hashed passwords and CRAM-MD5 auth

My question What are the risks of switching from MD5 to CRAM-MD5 passwords in the database, especially considering the following, and how to approach that for an existing installation (provided I ...
0
votes
1answer
37 views

Securing outgoing emails with logs of a web server

On the web server I am going to run rkhunter, tripwire, OSSEC, fail2ban and psad. All of those applications need to be able to send emails to notify the sysadmin. Therefore, I've: sudo apt-get ...
0
votes
1answer
30 views

Force PHP mail to avoid using postfix root@myorigin; use /etc/mailname instead?

I recently posted an issue setting up a mail server with postfix and virtual aliases. I solved the problem here: Postfix/Dovecot - Multiple Domains and Multiple Linux Accounts To sum it up, I set ...
3
votes
1answer
65 views

Postfix/Dovecot - Multiple Domains and Multiple Linux Accounts

I have been trying to setup a new mail server to migrate from my VPS, as my host has decided to close its doors. The old server was running Exim/Courier (nearly a decade old at this point,) and I'm ...
0
votes
1answer
61 views

Postfix, dovecot, squirrelmail Failed to autocreate mailbox INBOX

I'm trying to create my first mail server with postfix, Dovecot and squirrel mail on Ubuntu 14.04 To get started did i follow this tutorial on this page. ...
-1
votes
2answers
77 views

Reverse DNS is not a valid hostname [closed]

I help a friend run a server, which includes a mail server. http://mxtoolbox.com reports that our reverse DNS is not a valid hostname. The reverse DNS currently points to domain.com. Should it point ...