All Questions
Tagged with postfix email-server
1,073
questions
-1
votes
0
answers
59
views
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 ...
0
votes
0
answers
14
views
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 ...
0
votes
0
answers
33
views
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 ...
- 507
2
votes
0
answers
65
views
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 ...
1
vote
2
answers
117
views
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 ...
- 125
0
votes
0
answers
24
views
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 ...
0
votes
0
answers
18
views
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....
0
votes
1
answer
99
views
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....
- 1
0
votes
1
answer
41
views
(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 ...
- 1
-1
votes
1
answer
124
views
IRedMail server rejecting mails
Hi I have installed my web mail. and I found it's listed on spamhaus. so I am tring to receive verify email them, this email is rejected.
Logs:
Feb 9 17:44:01 mail postfix/postscreen[2033648]: ...
- 21
0
votes
1
answer
290
views
opendkim not singing my outgoing emails ubuntu 20.04
i'm following this tutorial to integrate opendkim and sign my emails,i'm not much in ubuntu but i configured everything as the tutorial but the emails is sent without dkim signing
I'm hitting the wall ...
- 1
0
votes
1
answer
190
views
Postfix+Dovecot: emoji in subject from command line break the delivery ("SMTPUTF8 is required, but was not offered"), works from Gmail
Tl;dr: if I send an email to my Postfix+Dovecot server with the subject containing UTF-8 characters
email from Gmail => Postfix+Dovecot deliver the email correctly
email from mail (command line) =&...
0
votes
1
answer
55
views
Why pickup service needs wake up from Postfix master?
The Postfix master.cf file contains a definition to wake up qmgr service:
# ==========================================================================
# service type private unpriv chroot wakeup ...
- 802
2
votes
2
answers
801
views
Add Multiple Subdomains In Signing Table And Key Table Opendkim
I need some major help adding multiple subdomains in the signing table and key table for opendkim without listing them one by one.
If I have 50 subdomains I want to add, it will take me forever.
I am ...
0
votes
1
answer
82
views
Can iptables state miss some packets?
I tried to setup the iptable rules for MTA. As this MTA is meant only for receiving the emails I allowed INPUT packets from any to destination port 25 with state either new or established, and allowed ...
- 47
0
votes
1
answer
150
views
what comes first smtpd milters or cleanup in order of filtering in postfix?
Based on the documentation of the postfix (as stated here: 'https://www.postfix.org/SMTPD_PROXY_README.html') the smtpd milters should be used to filter the emails first and then the cleanup service ...
- 47
0
votes
1
answer
347
views
Milter Application Error Postfix Email Server
I am trying to sign the emails on my email server with opendkim but I am running against an error that I just can't seem to fix. The error I am getting is: warning: milter local:opendkim/opendkim.sock:...
- 31
0
votes
0
answers
100
views
Dovecot not receiving mail while making use of vmail
Below is my current vmail configuration.
auth_mechanisms = plain login
auth_username_format = %n
protocols = imap lmtp
# Search for valid users in /etc/passwd
userdb {
driver = passwd
...
0
votes
0
answers
84
views
Issue with 'delay_reject=no' and smtpd_helo_restrictions in Postfix
In Postfix MTA, I have set helo and client restrictions with the DISCARD policy. But since setting delay_reject=no I am getting this error just after connect from for some clients (don't know if they ...
- 203
0
votes
1
answer
152
views
In postfix can I mention sender access map in client restriction?
It's a question out of curiosity rather than necessity. What should happen say I place sender access map inside smtpd_client_restrictions and also place client access map in smtpd_sender_restrictions ...
- 203
0
votes
1
answer
99
views
In postfix how parent_domain_matches_subdomains helps rejecting mail for subdomains?
Based on the standard configuration given in https://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall the parent_domain_matches_subdomains = debug_peer_list, smtpd_access_maps should help ...
- 203
1
vote
1
answer
176
views
Why is it advised to disable relayhost when hosting mail server behind firewall?
I am trying to setup an MTA. While reading documentation I came across "Standard Configuration" for Running Postfix behind a firewall.
I am confused on this part:
IMPORTANT: do not specify ...
- 203
1
vote
2
answers
46
views
Can I log when the message arrival rate exceeds the message delivery rate in postfix?
I am trying to implement a MTA, on reading documentation of the postfix I found a parameter 'in_flow_delay' whose description in sort says 'Time to pause before accepting a new message, when the ...
- 47
0
votes
0
answers
56
views
What is behaviour of opendkim while verifying an email with multiple dkim signatures?
I am trying to implement DKIM verification using Opendkim and postfix. The doubt I am struck by is what will happen if the email has more than one DKIM signature and one of them fails (as like failed ...
- 47
2
votes
1
answer
125
views
What difference does it make to implement a feature as policy service vs as milter in Postfix?
I am trying to implement MTA using Postfix. I am struck at how to implement standard services like SPF, DKIM etc. as well as some custom services. They can either be implemented as policy delegation ...
- 203
4
votes
2
answers
991
views
What is difference between using smtp vs relay transport type in postfix?
I am trying to setup MTA which should submit different intranet mail gateways based on the recipient's domain. For that I thinks transport_maps in postfix should be setup for selective domains; if ...
- 203
2
votes
2
answers
238
views
How to restrict based on combined usage of sender email and client ip address in postfix?
I have a MTA (postfix) with sasl implemented. I want that for a subset of users I can map their email address to a particular range of ips (separate for each email user). If a user tries to send email ...
- 203
-1
votes
1
answer
226
views
How to bypass postfix milters for certain users?
I am trying to set up an incoming MTA server using Postfix. I have specific requirements that some users' emails should not go through the milters. Is there any way this can be done in Postfix? One ...
- 203
0
votes
2
answers
358
views
Too many connect from unknown postfix
I am trying to set up an incoming email server by using postfix as MTA the issue I am facing is that there are too many 'connect from unknown' lines in the log. Can anyone help can I debug this issue? ...
- 203
1
vote
1
answer
310
views
Configure postfix virtual transport to deliver mail to arbitrary (local) addresses
I'm using Postfix in a very niche application with no inbound or outbound SMTP connectivity (other than via the loopback interface).
I would like to configure the postfix virtual transport to deliver ...
- 45.6k
2
votes
1
answer
342
views
What are the correct settings to enable TLS between Postfix and Dovecot via LMTP?
I am trying to get Postfix to forward mail via LMTP to Dovecot. This works fine when TLS is turned off in the settings on both sides.
Once TLS settings are enabled, Postfix connects via LMTP and ...
- 4,646
0
votes
0
answers
33
views
How to have different postfix options based upon destination email address
I need to configure postfix in such a way that the options used vary dependent upon the destination email address. For example, I might have destinations such as [email protected], [email protected], user@baz....
0
votes
1
answer
206
views
Does LMTP support authentication?
Scenario:
A Postfix Server runs on a VPS with a hosting company.
A Dovecot IMAP server runs inside the office.
We want Postfix to push mail it receives to the Dovecot IMAP server, using the least ...
- 4,646
0
votes
0
answers
159
views
Postfix - limit outgoing messages sent by one specific user
I want to limit outgoing messages to 5 per hour for a single user. It should then queue any additional messages during that hour to be attempted for delivery later. All other users should not be ...
- 1
0
votes
0
answers
118
views
Postfix Trigger script when E-Mail was Sent
This is my first Post at serverfault.
I hope someone can help me.
My setup looks like this:
I have a RabbitMQ where emails are queued.
I've written a small Python tool that retrieves one email at a ...
- 1
0
votes
1
answer
224
views
Postfix seems to be running and listening on the public network interface, but external clients cannot connect?
I'm setting up a new Postifx server on Debian 12. I've installed the Debian package and confirmed that Postfix is running, and is listening on ports 25,465, and 587.
Postfix is running and there are ...
- 4,646
0
votes
1
answer
400
views
With postfix, how do you setup SASL with dovecot to receive SMTP mail and cyrus to authenticate?
I had a static IP address and setting up my mail relay was as easy as:
mynetworks = ... <static IP address> ...
(and of course authorize all incoming mail from mynetworks).
Now that I do not ...
- 2,316
0
votes
0
answers
95
views
Postfix+Dovecot: filter email with certain `To:` address
I have a postfix+dovecot email server. There is one mailbox that was used by the Procurement department in many online shops and the address got disclosed and included in a spam list.
I would like to ...
- 123
0
votes
2
answers
495
views
Can I Force Implicit TLS Connection For Port 587 On Postfix?
I have read many articles saying port 587 by default is explicit TLS. This means it's STARTTLS. It asks the server on an unsecured connection if TLS is supported and if it is, it continues with an ...
1
vote
1
answer
255
views
Wrap plain text mail in html
we use Postfix as MTA to send our mails from our system. Unfortunately we have an old persistent system which we cannot change, which sends mails to our customers in plain text format. I would like to ...
- 15
0
votes
3
answers
148
views
Postfix: How can I handle incoming mail for a single address, not the entire domain?
I've gotten my employer to configure the company-wide Exchange server to forward [email protected] to [email protected], a host I control. So far, so good. My Postfix configuration ...
- 131
1
vote
1
answer
607
views
Deliver mails in Maildir in /var/spool/mail with Postfix
I search for hours without finding the solution and it drives me crazy.
Is it possible to ensure, without using Procmail, that Postfix delivers emails in the form of Maildir {cur,new,tmp} in
/var/...
- 13
0
votes
2
answers
200
views
Receive notification whenever someone marks email as spam POSTFIX
I have created a mail server using Postfix. I have added a 1x1 tracking pixel to track email opens.
I would like to receive a notification either on an http endpoint or my email address whenever ...
- 101
0
votes
1
answer
125
views
Dovecot says user does not exist although it's in MariaDB database
I use a MariaDB to store users for Dovecot 2.2.10. The Dovecot keeps giving "Disconnected unexpectedly" errors, and I can't find a reason. Is there anything I could look at?
Mail logs
Aug 29 ...
- 53
3
votes
1
answer
890
views
Linux port 25 is not working, and postfix unable to establish external connections at port 465, internal connection works with issues
I guess these are two typical issues, at least first one is. I'm trying to configure postfix dovecot on CentOS 7.
First, the port 25 is open, but it is not accepting any outer connections.
The ...
- 53
1
vote
1
answer
1k
views
Troubleshooting SMTP and IMAP Configuration for Postfix Email Server on Ubuntu
I've recently installed Postfix and dovecot on my linux machine running Zorin OS 16.3(Ubuntu Based Linux Distro) to be able to host my own email server for my website.
The server is port forwarded ...
- 111
0
votes
0
answers
51
views
"mail spamd[495361]: internal error, python traceback seen in response" on Ubuntu 20.04 when receiving email from gmail. How to debug and fix?
I am running Ubuntu Server 20.04 on a Raspberry Pi. It is set up as a web/email LEMP server. When I send an email from my gmail account to a an email address on my LEMP server, I get an error from ...
- 93
0
votes
1
answer
273
views
POSTFIX - sending mails. My mails sent outside bounce back
main.cf
compatibility_level = 2
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix/sbin
data_directory = /var/lib/postfix
mail_owner = postfix
myhostname = mail.aufy.pl
mydomain = aufy....
- 13
0
votes
1
answer
68
views
Postfix cleanup logs not showing all mail ids in Cc header
my main.cf file contains
line_length_limit=4000
append_dot_mydomain = no
#delay_warning_time = 4h
readme_directory = no
compatibility_level = 2
transport_maps = hash:/etc/postfix/transport
...
- 1
0
votes
1
answer
766
views
Redirect local host mail to mailcow mail server ubuntu
I've installed mailcow dockerized on ubuntu 22.04 host. There is some instruction how to setup local mtu with postfix (sendmail is ubuntu default) https://docs.mailcow.email/post_installation/...
- 235