All Questions
614
questions
0
votes
0
answers
34
views
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, ...
- 211
-2
votes
1
answer
54
views
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 ...
1
vote
1
answer
117
views
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>...
- 13
0
votes
1
answer
87
views
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 ...
- 3
2
votes
1
answer
284
views
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 ...
- 226
0
votes
3
answers
90
views
Why is Postfix sending private information? [duplicate]
My (external) webserver has postfix installed. I use it as a SMTP server for my private email. I'm currently investigating a problem where hotmail/outlook/live sees incoming email from me as spam, ...
- 289
-1
votes
1
answer
337
views
Sending email with postfix on a specific IP address fails. Error 81126 with Gmail
Recently, I started to receive errors from Gmail:
host gmail-smtp-in.l.google.com[142.250.110.27] said:
550-5.7.25 [X.X.X.X] The IP address sending this message does not have
a 550-5.7.25 PTR record ...
- 109
0
votes
1
answer
198
views
RHEL + how to know the limit of concurrent connections number per port?
how to know the number of concurrent connections per port on RHEL 7.x machines
for instance, let say we connect to port 9080 with XXXX concurrent connections.
wget http://server_mngmnt.jupiter.com:...
- 637
0
votes
0
answers
64
views
postfix MTA seemingly benign I/O Error : postqueue fatal: output write error: Input/output error
I am getting the following message in my syslog exactly every 30 seconds. Everything is working but words like "Fatal" and "Input/output error" cause me an inordinate amount of ...
- 21
0
votes
1
answer
35
views
Why does mailman replace non-Latin letters with crooked ones?
The essence of the problem is that when sending an html letter with formatted text inserted from another source containing non-Latin letters (for example, copied text from a web page in Polish), the ...
0
votes
2
answers
280
views
Postfix/Dovecot presenting default SSL certificate from Apache to Thunderbird client
I've been struggling with this issue for some time now.
I want thunderbird to get the certificate for mail.******.cl, but it always seem to get ******.cl.
So I've done a couple of tests, and realized ...
0
votes
1
answer
99
views
postfix sending only short messages ( emails ) but not long messages?
when I am sending a short email from "[email protected]" or any other email acc , the message is received well in the inbox of Gmail , hotmail etc , but if I send the message again with long ...
- 209
0
votes
2
answers
201
views
Spammers are using my mail server to send out emails
Lately spammers are using my mail server to send emails to different addresses.
For example, a colleague of mine received an email that was supposedly self-sent (it was not).
Looking at the ...
- 1
0
votes
0
answers
21
views
thunderbird logs in after adding a double domain name
I've spent my last few days migrating my email server to another server location, all my config files are the same etc. But for some reason i keep getting weird issue's on the new server.
I'd like to ...
0
votes
1
answer
387
views
Postfix catch-all for all domains/users and send mail to external mailserver
I am configuring a mailserver that has to save all email for any domain and any user and store it in the mailfolder of one specific user. For this I have used the following configuration:
...
- 1
0
votes
1
answer
155
views
Roundcube imap domain
I have configuration Postfix+dovecot+roundcube. I have installed certificate SSL on domain main.example.com so when I have added below imap configuration test is OK and roundcube works.
When I write ...
- 1
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
0
votes
0
answers
36
views
Make postfix retry PNCR Status (5xy code)
Every now and then I am forced to send medium volumes (100-1000 mails) to microsoft smtp servers (outlook.com/hotmail.com)
outlook-com.olc.protection.outlook.com
Remote Server returned '554 5.7.1 <...
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
0
votes
1
answer
132
views
OpenDKIM & OpenDMARC on SLES 15 SP2
Hello is it possible to install OpenDKIM & OpenDMARC on SLES 15 SP2 through the default repository of OpenSUSE?
0
votes
1
answer
459
views
Postfix warning: not enough free space in mail queue
I have already checked the solutions at this post, but I can't find the reason.
This is my situation:
Running postfix inside a docker container (docker swarm).
Docker container has no quota.
/var/...
- 469
1
vote
1
answer
150
views
Postfix permit_sasl_authenticated before content_filter
I have a postfix + dovecot + spamassassin setup which works great, but I would like to bypass all outgoing messages (sasl authenticated) from spam filtering. I must do something wrong, because I ...
- 121
0
votes
1
answer
93
views
postfix logging no the known defaults
Actually i overtook the administration of a mail cluster which uses postfix. And i was really confused when i saw the different loggings:
one of the servers logs to a custom logfile, instead there is ...
- 11
0
votes
1
answer
326
views
Postfix: Can't send mails from another network
I recently set a postfix (+dovecot) mail server (on a VPS) and when I am in my own home network, which I put in mynetworks, I can both send and receive mails.
However when I am outside home I can only ...
- 21
0
votes
1
answer
450
views
iptables - port 25 not getting traffic even though default policy is ACCEPT and all rules are flushed
I am having a problem that's driving me up the wall. I have a server, where after several attempts at various iptable rules, I have flushed iptable rules and set default policy to accept.
The output ...
- 121
1
vote
0
answers
822
views
clamav-daemon doesn't create /var/run/clamd.ctl
I installed clamav-daemon on Debian 11 and when I try to start it, it doesn't create the LocalSocket /var/run/clamd.ctl.
LocalSocket in my /etc/clamav/clamd.conf:
LocalSocket /var/run/clamav/clamd....
- 111
0
votes
1
answer
124
views
Custom error in Postfixadmin
can you please help me to add a custom error to Postfixadmin. In the config.local.php file I add the following to $CONF['password_validation'] = array()
'/([-#*.!@$%^&(){}:;<>,.?~_+=|].*){1}/...
- 7
0
votes
1
answer
65
views
Postfix server cannot recieve email
I've been having issues with getting my postfix email server to accept emails. I started with port 587 open, but whenever I would send an email to that, it would seem like nothing happened, and /var/...
- 103
0
votes
1
answer
39
views
Postfix - Auth restriction with multiple servers
I'm running two mailservers for one domain. One of them is a Microsoft Exchange server that holds a few mail accounts - and a Postfix one hosted on my Linux server to which mails are relayed from ...
- 3
2
votes
1
answer
213
views
Postfix: Bounce incoming email, but still deliver
I run my own mailserver but I am getting "spammed" by a certain individual. In order to try to discourage this person from sending me any more emails, I would like to bounce the incoming ...
- 289
0
votes
1
answer
688
views
Duplicate message delivery to always_bcc with dovecot and Simple Content Filter (Postfix)
I'm trying to set up a very low traffic postfix mail server using:
A Simple content filter (http://www.postfix.org/FILTER_README.html#simple_filter). It's way simpler than the advanced one and the ...
0
votes
1
answer
611
views
Roundcube can send mails but doesnt receive mails
SYSTEM INFORMATION
OS type and version: Debian Linux 10.13
Webmin version: 1.941
Virtualmin version: 6.08
In the past I had no problems sending and receiving mails on my virtual domains I think all ...
- 11
1
vote
1
answer
115
views
Why do emails to a user in my database with an alias domain hit the server but get bounced (and the inbox is not created)?
;tldr
Can anyone tell me what's wrong? Why do emails to a user in my database with an alias domain hit the server but get bounced (and the inbox is not created)?
Background
I have postfix pgsql set up ...
- 11
1
vote
1
answer
2k
views
How to upgrade postfix 3
I have postfix installed on a server. From what i can tell it was installed using this steps https://computingforgeeks.com/installing-postfix3-on-centos-7/
I was not involved in installing it so i don'...
- 111
-2
votes
1
answer
435
views
Postfix: Failure sending mail. Connection refused
I have Postfix server installed on my Digitalocean droplet along with my ASP.Net WebApi on docker container.
When I try to send mail from my ASP WebAPI app I get Connection refused exception. Here ...
1
vote
1
answer
2k
views
Postfix mysql warning: /etc/postfix/sql/mysql_virtual_alias_maps.cf: Permission denied
I am running postfix on an ubuntu 20.04 server. I am trying to fix some warnings in my /var/log/mail.err file I am getting the following:
Aug 9 09:34:45 mail postfix/proxymap[281260]: error: open /...
- 93
0
votes
0
answers
263
views
Postfix sending from root@server even when From: specified in header, mail not being delivered
I'm writing a bash script that will email an alert when various system resources are used beyond a certain threshold.
I've set the script to make the first line of the email body "From: ALERTS ...
- 101
1
vote
1
answer
596
views
How do I get postfix to log the Helo/ehlo responses?
I need to get access to the Helo responses in order to make sure everything is set up correctly on the mail server.
- 13
1
vote
2
answers
1k
views
How to make Postfix listen on few IP addresses with correct certificates?
I've got problem setting up postfix to listen on few (3 actually) IP addresses, on port 25, using correct SSL certificates.
Background: I'm using Debian 11, with Postfix (v 3.5.6 from repo)/Dovecot ...
- 13
1
vote
1
answer
537
views
postfix removing body of bounced messages
I've noticed for messages that fail to deliver with postfix, the body of the message is removed. Here's an example (real emails replaced with temps):
--5F54EFCA0A.1653443634/MYDOMAIN.COM
Content-...
- 111
0
votes
0
answers
2k
views
Sender dependent relay with transport maps in postfix
We have some SMTP server in our company. We have transport maps in which we define what domains send to other smtp server. Now, we need sender dependent config for some users. The users are using same ...
- 1
0
votes
1
answer
985
views
Warning Message after Postmap Header_Checks with Postfix
I'm using postfix-pcre on my Ubuntu Server.
If I test my header_checks configuration with the following command
postmap -q 'To: "Markus Schlei" <[email protected]>' regexp:/etc/postfix/...
0
votes
2
answers
61
views
Postfix receive email after bad configuration
I had a bad configuration on my postfix server so I didn't receive email.
After my correction (delay 24h) I receive email but not all one shot, maybe one email by 15-30min.
Is there a command for mail ...
2
votes
2
answers
849
views
body_checks: How to filter base64 encoded content?
The idiomatic answer is probably "don't - use a filter that decodes the message first", but as can be seen in the second answer to that question, it should also be possible with body_checks ...
- 73
2
votes
1
answer
3k
views
Postfix still uses port 25 despite configuration saying port 587
I have a postfix server that is a relay for the main mail server.
That main mail server is to be used with the 587 port when i do a telnet on it it works just fine :
telnet 10.10.10.10 587
Trying ...
- 23
1
vote
1
answer
3k
views
How to disable client-initiated renegotiation in Postfix?
How to disable client-initiated renegotiation in Postfix?
- 132
1
vote
1
answer
2k
views
How do I automatically BCC received mail to multiple users in Postfix?
I am trying to link up a dummy email address to two different email addresses:
[email protected] -> [email protected] and [email protected]
This would mean that mail sent to [email protected] ...
1
vote
0
answers
4k
views
Postfix mail server not sending email
I had a postfix server that I had to restore from a backup and deploy onto a new server. Using the new server, the domain name is not allowing me to send email. I am able to receive emails but sending ...
- 13
0
votes
1
answer
396
views
Postfix rejects incoming mails
Dec 13 15:14:11 raspberrypi postfix/smtpd[7702]: connect from mail-wm1-f52.google.com[209.85.128.52]
Dec 13 15:14:11 raspberrypi postfix/smtpd[7702]: warning: connect to Milter service local:/opendkim/...
- 11