Questions tagged [postfix]
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` (non-default content of main.cf) and `postconf -M` (content of master.cf)
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Should smtp_helo_name always be the same as your MX record?
I can't seem to satisfy HELO checks on SPF records in all cases. I have an SPF record for my domain like this:
"v=spf1 mx -all"
The MX records in the zone are:
mx0.mydomain.org.uk. ...
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Postfix Mail being redirected to private inbox
I am relatively new to Linux, setting up servers and especially handling mail related things. I've bought a new domain and rented a VPS, which now hosts my website. I need a more open environment for ...
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openarc: can't parse Authentication-Results
I've just set up openarc on fedora38 with postfix-3.7.9. I believe it's working properly, but I have a few questions.
I'm seeing messages like this periodically. I've found another similar report from ...
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7
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Why does the SpamAssassin not insert some headers?
Trying to configure SpamAssassin 4.0.0 with Postfix 3.7.10 on Debian 12. I'm using spamass-milter 0.4.0. My /etc/spamassasin/local.cf has the following entries:
required_score 5.1
...
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14
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Multiple Postfix Instances *without* postmulti
I have been running multiple instances of certain services (php-fpm, mysqld, httpd) and am now trying to do the same with Postfix.
Searching online, I have so far only been able to find descriptions ...
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33
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postscreen "deep protocol" tests and multiple MX IPs?
In the Postfix postscreen readme, it says the main limitation of "after 220 greeting" tests is that a new client must disconnect after passing these tests. To partially mitigate problems, it ...
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33
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Postfix Blocked by SELinux
Struggling getting Postfix to run properly on CentOS9, I have it working sending a mail when I call webpage that has the code for a hardcoded email test.
The issue is on a contact form on the website, ...
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Outlook.com does not send mails to my Postfix server but terminates SMTP session immediately with "QUIT"
I am running my own Postfix instance. TLS certificates are from Letsencrypt, DANE and DNSSEC is working. Outlook. com is unable to send any mail to my Postfix instance, but closes the SMTP session ...
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37
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Configure fail2ban to parse multiple log lines, e.g. Postfix mail rejects
I want to to block local authenticated mail users who generate spam, i.e. disable their SMTP access for a while as one of several countermeasures against hijacked accounts and malware.
To accomplish ...
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34
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Postfix virtual mailboxes with only one single domain
I have read the Postfix documentation for virtual mailboxes but I can't find methods for my use case, with is shared domains, both UNIX and non-UNIX accounts, because I only have one domain. But ...
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How to monitor users usage of GPG keys on company email server
I've been tasked to monitor our user's usage of PGP keys (ie: how many emails are sent/received using PGP). How can I go about doing this? We all use Ubuntu and the Thunderbird email client and ...
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Postfix connection timeout to all servers
I have Postfix on an Ubuntu server.
postconf mail_version
mail_version = 3.6.4
Every email i send to any recipient ( tried gmail , hotmail and yahoo ) , is stuck in the queue
(connect to alt2.aspmx.l....
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96
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Postfix client submission using TLS
I recently set up a Postfix mail server on Ubuntu to relay emails from my apps to Office365. Postfix to O365 works without problem but I also want my apps to connect to Postfix using TLS where ...
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119
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Postfix Restrictions sender recipient
I am trying to implement a blocklist for senders and domains in my postfix (Debian 12) setup.
This is what I have so far:
smtpd_sender_restrictions =
permit_sasl_authenticated,
...
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65
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how to protect postfix mail from gmail spam [duplicate]
I am experiencing an issue with the BDIX (Local Bangladeshi server) server.
I have set up a mail server on the local BDIX server using postfix with aapanel.
I have configured SPF, DKIM, and DMARC in ...
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4
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Postfix alias vs. virtual_alias for catch-everything-else?
I have postfix running fine with aliases. So I got an email [email protected] mapped to my local user [email protected]. Same for alias2 and so on.
Unknown users (or aliases) get blocked by postifx.
Now I want ...
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2
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2
answers
73
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Send emails via connected camera to postfix server
I have a debian VPS with a Postfix server on it and I want to deliver local mails sent by connected cameras.
Here is my postfix main.cf :
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff =...
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23
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Postfix configuration to block spammer domain isn't working
I have an Ubuntu 22.04 cloud VM with Postfix 3.6.4-1ubuntu1.3 installed that I largely use for receiving e-mails sent to addresses at my personal domain that I provide when signing up for less-...
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How to route email in Postfix depending on both the origin and destination domain?
I have a Postfix server sending emails for a few different domains. Ideally I'd like to directly send all outgoing messages directly to their MX, as email should work. I have DKIM, SPF and DMARC, I ...
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1
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How to run multiple email domains with port splitting? (like nginx proxy) [closed]
So im trying to make it so i have 2 domains, A.com, and B.com. they both use different email software (A.com has postal email server and B.com has modoboa) *something to also note, based on the ...
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2
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117
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How can I mitigate a flood of inbound emails that look legitimate to filters?
I have a mail server - postfix, amavis, dovecot. Currently one of my inboxes is being flooded with random email from all over the globe. It's like someone signed me up to 10,000 newsletters all at ...
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1
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Mail servers setup - HA
I would seek your expert guidance for this topic and your help would be really appreciated.
I want to setup mail service in my org in such a way that they are highly available and even if one of the ...
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1
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54
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Customise a configuration file from Dockerfile
I am trying to create a postfix container.
What I want to do is to send emails from another container.
Here is what I've done:
FROM ubuntu:latest
RUN apt-get update && apt install -y postfix
...
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1
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61
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Postfix postmap header_checks warnings
I have the following postfix header_checks and they have worked well for years:
/^Date: .* 21.*/ REJECT Your email has a date from the far future. Fix your system clock and try again.
/^Date: .* 20[3.*...
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1
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117
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Understanding DMARC report - DKIM pass on SPF fail
I am looking for some help understanding a DMARC report for my email server. The xml content looks like the following:
<?xml version="1.0" encoding="UTF-8" ?>
<feedback>...
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31
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Postfix replace in body by adding CR
I'm trying to configure Postfix body_checks function in order to add a CRLF when an end of attachment is detected using this:
/(.+)--$/ REPLACE $1--\r\n
The regex is correctly applied but the \r\n is ...
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24
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SPAM and SPOOF emails from postfix mailserver
I created and configured a postfix server, basically its an smtp-only server. I added the domain i want to use in postfix main.cf, and also added other domains in virtual file. I installed configured ...
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11
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Postfix header_checks regular expression not working
I have the following rules that are not working:
if !/^From:\s(.+@domain\.com)/
/^Subject: (.*?)$/ REPLACE Subject: [EXT] $1
endif
It suppose to alter Subject line by adding [EXT] as prefix if if not ...
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How to change the sender address using mailutils and postfix?
May 27 14:19:33 localhost postfix/qmgr[21793]: 87FD870AD12: from=user@localhost,
size=398, nrcpt=2 (queue active)
May 27 14:20:03 localhost postfix/smtp[22591]: connect to
mail.rungel.net[95.168.160....
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1
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87
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Postfix check_sender_access not blocking certain addresses
I keep getting spam emails from 'ional.co.uk'. I've got an address based blocking solution which handles all other emails just fine, but somehow this domain keeps getting through.
Full files I can add ...
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1
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54
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Postfix body_checks rejected a message — how can I find out which regexp was fired so I can remove that from the filter?
I have a body_checks file for postfix.
Unfortunately I rarely, but sometimes important mails are not received, because they are rejected by the body_checks, although there should be no match. Here is ...
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1
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99
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Saslauthd service not starting after upgrade to Ubuntu 24.04
I stuck with not starting saslauthd service after upgrade Ubuntu to 24.04 (it runs along with Virutalmin). So i can't authenticate to smtp (cant send mails, but still can recieve) due to error:
454 4....
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2
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57
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Not able to connect to MySQL from postfix
opensource community
I am using Postfix, dovecot and Postfix Admin for my complete email setup
I am using virtual users so I have installed postfix-mysql and dovecot-mysql
Issue:
My postfix service is ...
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36
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Postfix install on docker desktop don't send email and I find no logs
I need to set up a postfix server to send emails. After a few searches, I stumbled upon this tutorial: https://www.linuxbabe.com/mail-server/setup-basic-postfix-mail-sever-ubuntu.
Because I remember ...
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2
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272
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554 5.7.1 Relay access denied - cant send mails
I tried to upgrade debian from 10 to 11 and the everything got messed up. Im trying to fix postfix. I can receive emails but cant send. I get the error "554 5.7.1 Relay access denied"
My ...
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132
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Postfix Configuration: How to Save Outgoing Emails Locally Instead of Forwarding?
I'm facing an issue with my Postfix setup where it should be saving all emails locally using a custom script, but instead, it attempts to forward outgoing emails, leading to "Relay access denied&...
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2
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33
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postfix error handling to not lose the mail
I have a website with a form. When submit the form php sends a mail to a local gateway.
php code looks like this:
$ok = @mail($emailData['to'], $emailData['subject'], $message, $emailData['headers']); ...
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47
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How to add your own private keys to postfix configuration for DKIM without opendkim or the likes of it?
I have generated the keys locally through openssl added key.pub to the DKIM DNS txt Record but how to add it to postfix withouth any other tool.Is there any connfiguration parameter where the file ...
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91
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Postfix: Mail servers of certain providers are unable to send mail to my Postfix server / insufficient security / SSL alert number 71
There is big German email hoster (web.de) whose mail servers are not able to send mails to my self-hosted Postfix server. I found similar reports, but the published solutions always were misconfigured ...
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25
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Postfix accepting email from incorrect domain
I have a postfix setup and it appears to be accepting emails for other recepients and forwarding them to an existing legitimate email.
For example, we receive a spam email for [email protected], and postfix ...
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1
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41
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(Postfix) set rate_delay for 2 sending domains to 1 receiving domain
Currently I own 2 sender domains aaa.com and bbb.com. The restriction is that:
Each domain can only send one email after another with a delay of 200 seconds.
Each domain can only send 100 emails ...
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2
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63
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OpenDKIM key data deemed insecure
An email is not being sent and being logged by Postfix with the following error
default._domainkey.example.ws: key data is not secure: /etc/opendkim/keys/example.ws/default.private
is in group 124 ...
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1
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94
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Outlook timeout when adding IMAP account (dovecot, postfix)
I am adding a Postfix /dovecot mail server in Outlook 2016.
It works on my phone and I can successfully authenticate using:
doveadm auth test user pass
postconf -n
alias_database = hash:/etc/aliases
...
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2
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1
answer
284
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Postfix not updating Let's Encrypt certificate
Whenever I update the SSL cert on the server (Alma Linux) I restart Postfix. I usually do this a few days or a week before the certificate runs out. However mail connections always fail on the day the ...
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49
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Postfix with cyrus and saslauthd always accepts
I want to secure a relay with sasl.
saslauthd works
testsaslauthd -u weberjn -p ***
0: OK "Success."
Tried smtpd_relay_restrictions from the SMTPD_ACCESS_README:
# Relay control (Postfix 2....
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3
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227
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Why it's recommended to run Postfix in a chroot jail?
I understand that chroot allows to isolate Postfix, so if an attacker gives an access to one of a Postfix program, he cannot maliciously change something outside of the chrooted directory.
Seems that ...
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155
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SMTP Server: Postfix w/ Dovecot - how to configure the allowed username + password?
I seek a Linux-based SMTP server.
I've read tutorials and specs regarding Postfix SASL with Dovecot, though I can't find how to configure the list of username and password which are allowed to send ...
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29
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Postfix recipient rewriting based on recipient_canonical and the file .forward in the user home directory
Before posting this question, I already do some search on Google, serverfault, etc. and don't find anything (related to postfix and .forward)
Postfix - address rewriting - reply all
https://superuser....
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2
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39
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Need Postfix to send domaina.com to Gateway A, but if there is any other domains '*' in the same message send to Gateway B instead
I'm looking to set up Postfix to route emails from domaina.com to Gateway A, but if the email contains any other domain, I'd like it to be sent to Gateway B instead.
I was wondering if it's possible ...
0
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0
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47
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Postfix / Courier / Amavis - Move spam to junk folder
Running Postfix / Courier / Amavis / Spamassassin on my Debian 12 server. Using this setup for quite some time now. Everything is configured and works well (DMARC, DKIM SPF, MTA-STS etc.). Incoming ...
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