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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4
votes
0answers
1k views

opendkim fail | bad RSA signature | verification failed unprotected key

I have fully manageable VPS running Ubuntu 14.04 which hosts websites for several domains. Recently I have tried to add DKIM signatures to avoid spam filters. I've followed ubuntu-postfix-dkim ...
3
votes
0answers
82 views

Postfix: require valid sender address

Few days ago I received a message with ""@smtp.enta.net as the sender in both the From: and Return-Path headers. Postfix accepted that email and transport it to dovecot. Is it possible to configure ...
3
votes
0answers
98 views

Postfix reject_rbl_client Blacklists Not Working

I have a mail server (iRedMail) that uses Postfix. I've been getting a lot of spam, so I modified the /etc/postfix/main.cf file and have the smtpd_recipient_restrictions set to this: ...
3
votes
0answers
252 views

Configure mailgun as relayhost on top of existing postfix server already using sasl

I might be barking at the wrong tree completely here, but I'll ask anyway. I've followed a tutorial to setup a Mailserver on ubuntu 14.04 with postfix, dovecot and mysql. Now I have setup mailgun to ...
3
votes
0answers
45 views

I need help trying to authenticate with AD from my linux machine

I am not experienced in this, so there might be some points that I am missing. Initially I tried to setup Cyrus Mail w/ SASL for AD authentication. After several tries, it failed to work. I switched ...
2
votes
0answers
16 views

Postfix filter incoming mail

Currently I have a Postfix setup on a CentOS machine. It has multiple virtual_alias_domains and virtual_alias_maps = hash:/etc/postfix/virtual. There are multiple entries in /etc/postfix/virtual ...
2
votes
0answers
30 views

Extend Dovecot/Postfix setup with Calendar/Contact Sync

I am currently running a mailserver with dovecot (maildir) and postfix. Now one user has to sync his contacts and calendar with outlook and iOS using our service. The only way to do this seems to be ...
2
votes
0answers
24 views

Bad search filter - postfix, OpenLDAP, Saslauthd

I am trying to setup a mail server on Debian Jessie and have come across a problem that's doing my head in. When trying to access OpenLDAP through saslauthd via the command testsaslauthd -u user1 -p ...
2
votes
0answers
19 views

Properly Configure Postfix to be secure (SASL + TLS)

I've followed online tutorials online to setup my mail server with SASL and TLS, and amavis. It all seems to works - except i can send mails even if i don't authenticate first - which is not good. I ...
2
votes
0answers
18 views

Debian Postfix distribution list accessible only for few adresses

Actually I'm working with Postfix server and trying to implement distribution list with simple restrictions. My assumptions: I created alias: managers@mydomain.com -> manager1@mydomain.com, ...
2
votes
0answers
25 views

Postfix: deleting emails with recipient not in virtual_alias_maps

I'm getting a lot of spam for recipients that don't exist on my domain. I'm forwarding email on this domain to various external addresses for my family by using virtual_alias_maps. To prevent these ...
2
votes
0answers
80 views

Configure Postfix to route to specific IP based on the recipient MX record

I have Postfix running on a VPS with Ubuntu 12.04, the server has multiple IP addresses. I want to configure Postfix so that it will route mail to send via one of these IP's based on the MX record of ...
2
votes
0answers
29 views

Postfix relaying for multiple domains with Amazon SES

I'm a little confused about relaying with Postfix. I added this line to my /etc/postfix/transport mydomain34.com smtp:email-smtp.us-west-2.amazonaws.com I know this is wrong, but this is what I ...
2
votes
0answers
232 views

Recipient address rejected: User unknown in virtual mailbox table

I have a dedicated linux server running Plesk 12.0.18. On this server, I have running 61 subscriptions, only 1 have this problem. When I want to send an e-mail using roundcube from 1 of my ...
2
votes
0answers
115 views

Dealing with spam flood in Postfix + Amavis

I run a mail server for several thousand users. It uses Postfix + Amavis (with SpamAssassin + Clam). Most of the time it's a pretty happy setup, but from time to time we receive a flood of ...
2
votes
0answers
951 views

When does Postfix not perform lookups in virtual_alias_maps?

I'm having a real pickle of a problem: I have a Postfix 2.6.6 / CentOS 6 server that's set up to forward mail from specific aliases to specific destinations. This is done through a mysql ...
2
votes
0answers
231 views

Postfix mailbox_command + netcat + nodejs

I use Node.js script to process incoming emails and pipe them from Postfix via netcat in mailbox_command (namely: nc 127.0.0.1 3002). Node is listening on port 3002 and calls socket.destroy() once ...
2
votes
0answers
183 views

Mail Service requires reboot every few days

I'm kind of new to postfix so am hoping someone can point me up the obvious here I have a Postfix working as SMTP server and everything is fine for a few days. Then without warning or apparent reason ...
1
vote
0answers
12 views

convert plain text passwords to sha512-crypt in dovecot + postfix's mysql mailbox table

I have an old postfix + dovecot + Roundcube mailserver (mail.domain.Tld). Server clock is loosing time and adjusting it causes dovecot to kill itself, we cannot install more memory, bigger ...
1
vote
0answers
19 views

Postfix relayhost not working

I have a simple goal: I am setting up a monitoring system and I want this monitoring system to send me emails when a problem with my servers occurs. I have Postfix installed. And I want to use mail, ...
1
vote
0answers
15 views

PHP Script sending spams and mail.add_x_header not working

I've got my server hacked lately by some Php64 malware. Since then, I have found a lot of PHP files in my /var/www sub-folders. I am trying to delete each of these or clearing the files when some ...
1
vote
0answers
24 views

Is there a way to configure postfix to bypass spam/RBL checks on a particular destination hostname or username?

I'm running Postfix on CentOS 7, a fairly generic implementation, but I do employ some RBL checking on incoming mail. I like using SORBS for example but I have a few clients who seem to have issues ...
1
vote
0answers
100 views

Not able to send mail of Hotmail with your own postfix

I purchased DigitalOcean VPS in that installing cwp.admin open source panel. Also all configuration completed like postfix,rDNS,DKIM,DMARC,SPF,DNS Settings,etc... My problem is not able to send mail ...
1
vote
0answers
37 views

Postfix logs to remote log host

On my Ubuntu 14.04 server, I'm using Postfix as a front-end mailserver, and I would like to send all mail related info, including email addresses, to a remote host. In the file ...
1
vote
0answers
34 views

Postfix send SPAM

I come a few days being listed in the Spamhaus CBL. CBL list reports that I have a virus on the network and that is sending emails as "localhost.localdomain". I do not know where to be coming this ...
1
vote
0answers
34 views

Problems whitelisting senders in Amavis-new

I've a CentOS6 server with Amavis 2.9.1 + Postfix 2.6.6 + clamav 0.99 that I use as mail relay (aka mail gateway), with network set as follow: eth0 (10.10.132.104) as external inteface eth1 ...
1
vote
0answers
35 views

SSL_accept error with postfix oportunistic STARTTLS

I have configured postfix 2.6.6 on centos 6 as a mailrealy in front of an exchange 2010 server. Things work. Now I would like to add oportunistic encryption to incomming and outgoing mail. At least ...
1
vote
0answers
23 views

what's the difference between '/etc/aliases' and /etc/postfix/aliases'

In my system I've noticed that there are these two files, coming from different packages: /etc/aliases --> netcfg-11.5-27.1.noarch /etc/postfix/aliases --> postfix-2.11.6-19.1.x86_64 I've also ...
1
vote
0answers
74 views

postqueue: fatal: Cannot flush mail queue - mail system is down

Setting up a server, and I am having the damnest time getting postfix to send out an email! I have several emails in the queue, but when I force them I get this: postqueue: warning: unable to look ...
1
vote
0answers
47 views

Postfix with Dovecot Disconnects after STARTTLS on Port 25

I am having a lot of trouble setting up the Postfix to do STARTTLS. It seems that I could successfully send outgoing mail using Thunderbird. However, I can't seem to get the Postman SMTP for Wordpress ...
1
vote
0answers
33 views

postfix empty from when redirecting to return-path

We are sending mail from our server via postfix, and capturing bounces in an inbox via return-path. We're seeing an odd situation where sometimes the bounce rejection appears to happen directly during ...
1
vote
0answers
139 views

Postfix couldn't send mail on Ubuntu VPS server, network unreachable/connection timeout

I have a problem with postfix. When I am trying to send some mail from commandline, I get: Feb 14 12:44:35 some-server postfix/smtp[1022]: connect to ...
1
vote
0answers
28 views

Troubleshooting: Integration of SSL certificate into Postfix

In order to use TLS on my Postfix server, I have used directly the nginx ssl files from my other server, which also uses the domain that I want to use with postfix. I have integrated the files in the ...
1
vote
0answers
30 views

Postfix STARTTSL works in LAN but not from external (centos 7)

if I connect in LAN on port 25 to my mailserver it offers STARTTLS telnet mailserver.com 25 Trying 192.168.0.x... Connected to mailserver.com Escape character is '^]'. 220 mailserver.com ESMTP ...
1
vote
0answers
22 views

Redundant procedure when using Postfix relay

I have a Postfix server with the following main.cf file (I'll show just the relevant info): smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd ...
1
vote
0answers
56 views

Webserver to send emails from Postfix

I have a problem with my web server sending out email from websites through postfix. I have server that is running Ubuntu 12.04.5 and using Apache webserver. I have installed virtualmin on the server ...
1
vote
0answers
24 views

How do I use SRS rewrite the From header on a forwarded email message

I have a serious problem here. I run a labor dispatch website, where users can register their cell phones (I send them an auth code via text, they enter it at the website, it's entirely opt-in). A job ...
1
vote
0answers
16 views

PostFix/Dovecot new installation on Centos6

I have installed Postfix and Dovecot on my server. It seems to be mostly working - I can send mail from my account to a remote account no problem. My problem is receiving it. When I send an email ...
1
vote
0answers
20 views

Alias with all users in mysql table for postfix/dovecot

I have a table with users for my mail server. This table for imap authenfication in dovecot: ...
1
vote
0answers
88 views

How to detect SMTP AUTH attempts in Fail2Ban?

I have a Fail2Ban jail that monitors failed SASL authentications to my Postfix SMTP server. When this occurs, /var/log/mail.log contains these three lines: postfix/smtpd[32591]: connect from ...
1
vote
0answers
20 views

Postfix responds with 450 4.7.1 even though names resolve properly

The following is happening for reasons I do not understand. Excerpt: from mail.log Dec 21 17:03:56 server postfix/smtpd[13014]: NOQUEUE: reject: RCPT from unknown[10.X.X.40]: 450 4.7.1 Client ...
1
vote
0answers
19 views

Limit allowed envelope senders for Postfix's sendmail

I have a Linux server with local accounts (they are used by PHP-FPM processes) that are using Postfix's sendmail binary to send e-mails. All e-mails are sent through local Postfix to a central ...
1
vote
0answers
64 views

Postfix set EHLO name for virtual domains

I need to set EHLO name for my virtual domains. Postfix sending mail with EHLO as JV.localdomain where JV is my hostname my server ip is 62.210.xx.xx I am hosting 2 domains domain1.com and ...
1
vote
0answers
45 views

Postfix sending mails hundreds of times to e-mail address hosted on plus.net

I have a Postfix mail server handling mail relay for web sites. It's working perfectly and delivering hundreds of mails every day without issues. In the past few months, there have been 4 occurances ...
1
vote
0answers
19 views

Authnetication failure with postfix and sasl using sasldb

I'm really not sure what my issue is. I've checked several guides, and I am sure I have set this up correctly, including config fails, restarting the service, permissions etc. OS is Ubuntu Server. ...
1
vote
0answers
61 views

Postfix cannot start but dovecot is ok

My postfix service cannot start. Here is message: Job for postfix.service failed. See 'systemctl status postfix.service' and 'journalctl -xn' for details. And here is service status: ...
1
vote
0answers
1k views

postfix: lost connection after CONNECT/EHLO/unknown from unknown

seeing following error message while trying to send email via postfix on Centos 7 while I can receive and download messages not seeing any errors postfix/smtpd[24532]: connect from ...
1
vote
0answers
48 views

Postfix permit localhost use plain login

I have postfix 2.11 setup on Debian jessie with Dovecot SASL and I require encrypted login mechanism to send mail via smtp. For this purpose in the main.cf I've smtpd_tls_auth_only = yes option set. ...
1
vote
0answers
58 views

Postfix suddenly starts logging “unknown service: smtp/tcp”

Firstly, YES I'm aware of the other post about this, but it didn't help me. A short time ago our sysadmin unexpectedly left the company with no replacement or handover, and now it's on me for the ...
1
vote
0answers
222 views

Postfix fails to verify GMail's DKIM signature

I have my Debian (7.9 "wheezy") E-Mail-server (Postfix 2.9.6-2) setup to sign and verify DKIM signatures in e-mail messages using OpenDKIM (version 2.6.8-4). My server passes the DKIM test at GMail ...