Postfix is a free and open-source mail transfer agent (also "MTA"), written in 1997 and still actively developed.

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Why does postfix give “lost connection after EHLO” error when Gmail tries to connect to my SMTP server?

I'm trying to setup my gmail account so that I can send emails that appear to come from another email address I own (myuser@mydomain.com). Instructions to do so are here. When I try to do it, it ...
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2answers
48 views

Postfix SMTP SSL config: Can't send email but can receive it with SSL

I am trying to finish configuring my postfix/dovecot mail server that sits behind my home's router/firewall. I'm on Mint/Ubuntu 12.04. I'm close. I can connect/retrieve emails via SSL but can only ...
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10 views

Postfix can send but not receive mail

I just finished following this tutorial to set up a postfix mail server on ubuntu 14.04: https://www.digitalocean.com/community/tutorials/how-to-install-and-setup-postfix-on-ubuntu-14-04 When I ...
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21 views

Postfix on CentOS - Cannot receive emails

I'm trying with no success to setup Postfix on my server so I need some help (first timer here). Basically I cannot receive emails from anywhere. If I send an email to myself or to another address ...
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42 views

Can't receive mail, but can send mail? Centos 6 Postfix/Dovecot

I followed this tutorial to setup my webmail on centos 6: https://www.rosehosting.com/blog/mailserver-with-virtual-users-and-domains-using-postfix-and-dovecot-on-a-centos-6-vps/ Everything is setup ...
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2answers
35 views

How to deal with mail senders failing on STARTTLS?

I try to use my mail server richtercloud.de for subscriptions to vger.kernel.org mailing lists. I set up postfix 2.11 running on Ubuntu 14.04 and sending and reception works. I set up postfix to ...
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14 views

Configuration step by step of Postfix with chroot with debian amd64

Please, I want to configure mailscanner with postfix, but in the documentation, they said "configure postfix with chroot", but i can't do it Is there any documentation that explain step by step for ...
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11 views

How to add new 'From' email id each time sending email using PostFix server

I am new to PostFix and have setup PostFix as a server recently. In the testing, PostFix is working fine and relaying the emails with 'From' email address stored in the PostFix credentials files likes ...
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1answer
34 views

I'm having an issue with all postfix mail being rejected with “relay access denied” - Centos 6.5, postfix 2.6.6

If I use smtpd_recipient_restrictions, everything gets rejected with "relay access denied". If I use smtpd_relay_restrictions, everything gets through and ignores the whitelist. Not sure what's up; ...
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1answer
99 views

Fatal error (bad field count) while configuring Postfix

I'm using this tutorial to configure a mail server using postfix, dovecot and mysql. While configuring Postfix I have to uncomment the following lines and then restart Postfix with service postfix ...
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34 views

dovecot WILDCARD SSL (certicate.crt, private.key, intermediate.crt) not working

I have installed dovecot and postfix and got it working, but when I change the ssl_cert_file, ssl_key_file and ssl_ca_file dovecot configuration to my WILDCARD SSL certificate (working on apache) it ...
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12 views

Postfix not working with non self signed SSL Certificate

I have installed postfix and generated a self signed SSL certificate, it was working, then, I tried to configure it to use my WILDCARD ssl Certificate that is configured to apache2. Then I started ...
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1answer
15 views

Postfix bcc to ldap address

I am using Postfix with AD, and I want to send a copy of every email to their manager. Therefore I have these entries: cn: staff1 mail: staff1@company.com manager: ...
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1answer
52 views

sysvinit postfix startup script - only called with “status” argument

I'm having a problem with postfix not starting up on boot. boot.log doesn't show any information whatsoever. Starting the postfix service afterwards works as expected. I added debug information to ...
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38 views

Duplicate and relay mail from postfix

We currently use Google Mail for our teams email. We want to move to a self-hosted email server. Some of our team members prefer using Google Mails interface and asked if we could continue having ...
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23 views

Postfix allows unauthenticated users to send “local” mail

I noticed that my Postfix setup allows to send mails without authentication to recipients within my domain. According to this question, it seems that anyone can send mails to my domain pretending to ...
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0answers
57 views

Email Issue - “On Behalf Of Blackhole”

I am experiencing an odd email issue that I haven't been able to find any answers to. I have a Ubuntu server setup with postfix that uses mailgun to send emails. I'm not using the mailgun API, just ...
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44 views

Postfix auth with username containing an at sign?

How can I configure Postfix so that a user sending an email can authenticate with a full email address containing an at sign (@) and a TLD, such as "info@mydomain.com"? Currently my "info" account is ...
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29 views

user's mail server credentials for squid proxy

I have mail(virtual server, xen virtualization) and proxy servers on different physical machines. I have to configure squid proxy in such a way that users should be able to authenticate proxy using ...
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0answers
23 views

Server (with Postfix) is forwarding my email using a .forward file, is it still saved on the server?

I'm using Postfix on my server but not really using that for much because I have a .forward file setup for all accounts which forwards the email to someplace else, and never sending through the ...
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1answer
110 views

Linux/Postfix with relay: I can openssl to relay host on port 465, but postfix does not seem to connect

This looks like a tough one to me: I'm configuring postfix on my local home server running ubuntu server 14.04 LTS I was able to send outgoing mail through my relayhost on port 26, everything worked ...
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62 views

Detect spambot on ubuntu 12 TLS

Recently I discovered in my mail log that there is an enormous amount of spam being sent from my home server. I am running no websites, just zpanel. I closed down all the ports and am monitoring the ...
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83 views

postfix doesn't work with IP as hostname

Using Ubuntu 14.04 x64 I had a working installation of Postfix which was handy for sending emails in my terminal, but I had an issue with an application that was critical for my workflow. In order ...
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1answer
1k views

Postfix Relay Access Denied When Sending To Gmail With Telnet

I have postfix and dovecot setup to deal with mail for my domain. imap appears to work ok when reading local mail but when i try to send an email using telnet with localhost and the smtp port it gives ...
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2answers
37 views

Sending mails and narrowing what script does it

I'm using a very old Ubuntu server that was some time ago a mail server which was infected. Sadly there is a running web page on that server. Some script/page/malware is trying to send a lot of spam - ...
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1answer
46 views

Strange emails in postfix queue

Currently I am not sending any emails, I have postfix and dovecot installed but in the in the postfix mail queue I see strange emails almost every minute, i dont know from where is this spam ...
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1answer
116 views

Mailx is is not working

I have been trying to send emails throw Linux using echo "hi abhijeet2" | mailx -v Admin abhijeet123@gmail.com Whic works fine on other linux system ,but not working my system. I have tried to ...
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1answer
170 views

Postfix to send all mail to /dev/null except one address (alias)

My postfix server is working on a particular domain name through a relay, so it's like that: Client send to abs@subdomain.domain.com -> domain.com production mail server -> internal mail server on ...
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1answer
29 views

postfix virtual redirect not working properly

I setup postfix on one of my server to redirect incoming mails via virtual.db . I already changed my main.cf and added "virtual_alias_domains" & "virtual_alias_maps" my "virtual" file looks like ...
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53 views

Local SMTP Server — prevent spam flag?

I opened up port 25 on my router, so now I can use sendmail to send email. However, the emails I send are being marked as spam by my personal gmail account (understandably). The "from" field defaults ...
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51 views

Postfix mail server acting as an open relay

I'm trying to get postfix to work with mail clients (thunderbird / outlook), but the only way I can achieve it at the moment is by turning the mail server into an open relay, which is very bad, ...
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71 views

Postfix configuration: how to properly setup local addresses

I am configuring Postfix and SOGo and when I trying to sent email from one local user to another I got the status bounced error, unknown user: Error log: Jun 9 09:26:28 mail postfix/local[24266]: ...
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1k views

Google Mail blocking emails sent by postfix

I have set up an email server, but I have a problem with sending mails to Gmail. This is my /var/log/mail.log: Jun 4 20:49:26 jenny postfix/qmgr[6064]: 4CBDB67482: from=<mail@[...]>, ...
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1answer
126 views

Ubuntu + SSL ports + AVAST

I have an interesting problem with communication via standard SSL ports. Fresh installed Ubuntu 14.04 server + Postfix + Dovecot, SASL authentication provided by Dovecot, self-signed certificate ...
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138 views

Configuring email in PHP for Elgg using postfix

I am trying to setup PHP for running Elgg. I have PHP 5.5 installed in a Ubuntu 14.04 VirtualBox VM. I need to complete the following requirement (elgg requirements page) : Proper configuration and ...
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52 views

Ubuntu - Change postfix domain

I used this https://www.digitalocean.com/community/articles/how-to-set-up-a-postfix-e-mail-server-with-dovecot and this ...
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1answer
527 views

Can't send email to the internet from Postfix mail server. (Relay access denied)

I have a mail server running Postfix in my LAN with which I can send and receive emails in my LAN and send from the WAN to the LAN. I can't send from the LAN to the WAN though. I am trying to use my ...
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1answer
115 views

Configuring Postfix as SMTP relay (only)

I have a Postfix 2.5.1 on a Debian 4.0 PPC server. I intend to use this as an SMTP relay for outgoing email from my mobile phone (as my phone service provider recently dropped their SMTP server). The ...
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1answer
28 views

Postfix corrupting Japanese characters

I'm having a problem with certain Japanese characters being corrupted when sent by my MTA, Postfix. I've done some trial and error sending the same message from approx 7 different servers running ...
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1answer
34 views

Postfix Relay Based on Recepient

What is the best practice when one has to implement this sort of ruleset in postfix: Email sent to a@example.com, b@example.com, etc ought to be relayed to smtp.a.example.com. Email sent to everyone ...
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1answer
81 views

Postfix virtual users without database [closed]

I've made several attempts to setup a mail server. Each time, I find a tutorial to follow, and each time I get frustrated with the tutorial for one of the following reasons: The tutorial doesn't ...
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16 views

Unable to start Postfix from Virtualmin

I have a probleblem with starting postfix from Virtualmin, all email functions are disabled on my VPS. What should I do in order to re-enable it?
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1answer
345 views

Not able to send mail via Ubuntu VPS

I'm having a Ubuntu VPs with zpanel isntalled on it. There is something wrong going with the mail. Im not not able to receive the mails from my contact form on my wordpress site ( the site is hosted ...
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1answer
352 views

Postfix allows unauthenticated users to send emails

Hey I set up Postfix to use cyrus SASL implantation and I'm able to login and send emails, but I can still telnet on port 25 and send mails even if I'm not authenticated, which I whish to deny. ...
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28 views

Solving issue of similar user email account

I am using a VPS, CentOs 6.5, PostFix, Dovecot for hosting multiple email from different domains in my server. Which means, 5 different websites host their emails together. ex: info@some-company.com ...
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1answer
65 views

Domain [ Understanding ] issue when creating a Linux email server

Ok, here goes my paradoxical question. For about 1 year into my hobby-ish career, I used to buy my domains and a hosting package from Reseller Club. I purchased their " shared hosting " plan and ...
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23 views

Client computer blocked by postfix

I have been trying to connect from a Windows client computer to a Postfix server running on a Suse Linux Enterprise 2012 SP3 but it has been completely impossible. Connection is not possible either ...
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1answer
408 views

Roundcube login error

Using postfix, courier-imap, courier-pop, roundcube I get this error when trying to login through the roundcube web login: [08-Apr-2014 11:44:04 +0000]: IMAP Error: Login failed for user@domain.com ...
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1answer
18 views

Postfix with two vhosts

I've got this problem: I installed postfix (v. 2.10.2) on Ubuntu 13.04. I've got there two vhosts with two different sites, for example: aaa.com and bbb.com. Got those domains connected with google ...
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1answer
621 views

What permissions on /var/mail directory?

I've been suffering a permission problem in Postfix/Dovecot for a couple of days now. The setup is using virtual domains and users, so the path to user's home is /var/mail/<domain>/<user>; ...