All Questions
297
questions
0
votes
1
answer
80
views
CentOS 7: Postfix logs got cleared when running history -c. How can I investigate what happened the day the log was cleared?
By default, running history -c has no way of also deleting /var/mail/maillog, right?
How can I investigate what happened the day the log was cleared, or (by definition) when the new maillog was ...
- 113
0
votes
1
answer
461
views
Emails delivered, but no where to be found
I have been working on this for 2 days now and am desperate for some help.
Postfix & Dovecot
CentOS Linux release 7.9.2009
Plesk 18.0.50
For the most part emails are flowing into the server ...
- 141
-1
votes
2
answers
247
views
Firewall not keeping relay attempts from reaching postfix
I have a centos-based vps managed with webmin and every once in a while I get a few hundred emails like this one:
From: MAILER-DAEMON@mail.<redacted>.com
To: postmaster@<redacted>.com
...
- 120
2
votes
1
answer
288
views
Postfix / OpenDKIM config on Centos8
I've setup Postfix with Dovecot as an integrated mail service for my SaaS app, it worked great as an inbox. The issue started when I started to send emails, it was not signed so I went ahead and ...
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 ...
1
vote
0
answers
3k
views
Postfix unable to authenticate with Microsoft Exchange (No credentials were supplied)
I want to setup postfix on my nagios server to relay emails to our Microsoft Exchange server and I am running into issues with authenticating with Microsoft Exchange.
Specifically I am getting this ...
- 285
0
votes
2
answers
1k
views
How to create subfolder on mailbox from command line
On a CentOS 7 machine running Postfix and Dovecot how could I create subfolder named 'Bulk' on a inbox trough command line?
I thought to use the maildirmake command but this returns "maildirmake ...
- 3
0
votes
0
answers
1k
views
Could not execute: /usr/sbin/sendmail fails to send emails via PHP
I have a strange error in my Centos 7.9 Server running with Postfix as the Sendmailer program, It has a Website running in PHP-7.4
I get the below error Once in a while (not everyday but weekly or so)
...
- 4,522
0
votes
1
answer
714
views
Postfix : "Connection timed out" on all outbound email
Aug 25 12:56:20 mail postfix/pickup[375941]: ACF7F200E248: uid=0 from=<root>
Aug 25 12:56:20 mail postfix/cleanup[376172]: ACF7F200E248: message-id=<20210825125620.ACF7F200E248@mail....
- 33
2
votes
2
answers
2k
views
SELinux - blocks postfix emails sending out from the Web Application
My System environment, is Centos-7.9, Apache2.4, Php-fpm, PHP-7.4
I have postfix setup to send emails from the website, which is working in stand-alone test emails and when I turn the SELinux off.
...
- 4,522
1
vote
1
answer
3k
views
IMAP and SMTP Still use Self Signed SSL even I have issued a Mail Server SSL in Cyberpanel
I using cyberpanel on CentOS 7 and I setup SSL for my postfix and dovecot. But I still got "SSL Invalid" caused the self-signed SSL even I have configure SSL using Lets Encrypt.
This is /etc/...
- 21
0
votes
1
answer
131
views
Postfix outbound mail not leaving the server (bounced)
I am setting up outbound e-mail for a new Centos 7 server, it just needs to send from PHP not receive.
I've checked that port 25 is open and also listening on 0.0.0.0, which it is so netstat reports:
...
- 226
1
vote
0
answers
325
views
Php send mail from Cron (postfix + sendmail)
I have a PHP script that I run from cron. I never get emails.
maillog:
postfix/sendmail[2223187]: fatal: execv /usr/libexec/postfix/smtpd: Permission denied
Command-line:
* * * * * root /usr/bin/php /...
- 11
0
votes
0
answers
501
views
Cannot receive mails from outbound.protection.outlook.com
Im configuring a Kaspersky Secure mail Gateway to secure mail traffic coming to my exchange server.
Kaspersky secure mail Gateway is a centos Appliance running postfix.
I have no issue sending mails ...
1
vote
1
answer
2k
views
Rate limiting in postfix
So i have been trying to make a mail servddder which is functioning fine now what i want now is i want to limit the amount of mail a mail user can send I have tried and failed with policyd I also ...
- 73
0
votes
1
answer
181
views
Postfix email outside domain
I have a problem with the email forwarding, more like I do not know how to configure Dovecot to do what I want.
Per my understanding the first look up of mails that dovecot does is look up for local ...
2
votes
1
answer
4k
views
OpenDKIM reports "signing table references unknown key" (CentOS 8)
I'm attempting to configure OpenDKIM with PostFix on CentOS 8.
I've set the following in /etc/opendkim.conf:
PidFile /run/opendkim/opendkim.pid
Mode sv
Syslog yes
SyslogSuccess yes
LogWhy yes
...
- 155
0
votes
1
answer
196
views
Different email addresses of same email server for sending and receiving
I am actually a fresher in terms of configuring an email server.
Recently I configured a Postfix email server combining with dovecot and squirrelmail on AWS EC2 centos server, following this guide:
...
0
votes
1
answer
2k
views
SPF and OpenDMARC not working in Postfix
I am working on implementing SPF and OpenDMARC/DKIM to my mail servers.
Currently I have two mail servers in different subnets, each with separate DNS server and domain name. They can exchange emails ...
- 19
1
vote
2
answers
7k
views
Error while installing postfix on CentOS 6
I want to install postfix on CentOS 6 but I get the following error :
yum install postfix -y
Loaded plugins: fastestmirror
Setting up Install Process
Determining fastest mirrors
YumRepo Error: All ...
- 27
-1
votes
1
answer
477
views
get SSL certificate for mail server, while already having it for domain
I have already achieved an SSL certificate for my domain by certbot. the configuration is:
<VirtualHost *:80>
ServerAdmin [email protected]
DocumentRoot "/root"
ServerName xxx.com
...
- 21
1
vote
1
answer
995
views
Postfix refuses to connect to rspamd on CentOS
I have my mailserver setup configured based on this guideline (German), with the possibly important detail that I use CentOS 8 as a base OS instead of Debian. Everything works fine, except that I ...
- 11
-3
votes
2
answers
2k
views
Send mail via port 465 or 587 on Google Cloud VM / Postfix
I am trying to send mail from a VM instance on Google Cloud which I have recently set up and migrated everything over from my old server.
However, I have found out Google Cloud does not allow sending ...
google-cloud-platform
0
votes
0
answers
436
views
postfix smtp slow to send from clients (and sometimes does not authenticate), works fine with 'squirrelmail'?
I inherited a long time working postfix with courier imap box that runs run of the mill smtp. It seems to use fail2ban for firewall protection of some sort (never used fail2ban) and according to /var/...
- 157
0
votes
0
answers
293
views
I tried postfix restart, said service isn't running. Yet I am on my working mail server? (cent os)
So I am not sure what I am doing wrong. This all started with the need to let others from outside our network access the SMTP to send email from offsite.
So I had in /etc/postfix a check_clients ...
- 157
1
vote
0
answers
288
views
Mail going missing with Spamassassin, Postfix and Dovecot
I am setting up a new Centos8 server with Spamassassin, Postfix and Dovecot, ClamAV and Amavis.
All was going well until I added a third domain, the first two worked fine for receiving and sending e-...
- 235
0
votes
1
answer
59
views
centos 7 handling gitlab and mailserver
i'm quite noob with servers so here i'm asking a question.
i just installed a centos 7 on a vps. I installed gitlab and postfix on it. is it safe to handle both mail server and gitlab on it? ...
- 3
0
votes
0
answers
1k
views
send email by postfix - 454 4.7.1 Relay access denied
I configure mail server by Postfix and Dovecot.
I can receive and send mail in my server and check by telnet on port 25, but I can't send email from my local system by Thunderbird and get this ...
- 455
1
vote
1
answer
2k
views
Postfix - MX: Host not found error but dig and nslookup are OK
I had a working Postfix email server on Centos 7 when I decided to reconfigure my host networking (IP addressing, DNS, etc.), after reconfiguration, mail sending is no longer working.
/var/log/...
- 627
0
votes
1
answer
186
views
Postfix not receiving external mail
I'm running Postfix 2.10.1 on the same server as my webserver so the domain is example.com and it is receiving mail locally but not from any external networks. The server is running CentOS 7.
For the ...
- 25
0
votes
1
answer
5k
views
Postfix TLS unable to send (but can receive) mail
Using Roundcube (1.3.10) with Postfix (3.4.3) and Dovecot (2.2.36) on CentOS 7 VPS.
I can login and receive emails, but I cannot send them. Trying to send mail results in it hanging: "Waiting for ...
- 125
1
vote
0
answers
2k
views
Postfix error: status bounced/deferred
I tried setting up Postfix 2.10/Dovecot 2.2 email server for my domain on my CentOS 7 VPS, but I have met my match and must defer to the internet. I am using Nginx and MariaDB with PostfixAdmin, and ...
- 125
0
votes
1
answer
356
views
Why is postfix not receiving mail in /var/spool/mail?
I am on CentOS/EL7 AWS Lightsail host trying to configure postfix to deliver incoming mail to user accounts. However, I am not yet to the point where I see the mail arriving in /var/spool/mail/*.
A ...
- 195
2
votes
1
answer
563
views
Postfix forwarding [open relay]
Good day to you all.
Today, I was setting up postfix on my CentOS 7 vps.
What I want
I would like my server/postfix act according to the following rules:
Everyone on the planet should be able to mail ...
2
votes
0
answers
4k
views
Postfix not sending emails (few problems detected)
Emails can not be sent to domains other than local.
My mail server is placed behind proxy server. Ip of the proxy is: 192.168.18.1.
Just to mention that I can receive all emails sent to my mail server....
- 863
1
vote
0
answers
740
views
Connect / disconnect unknown postfix log
I'm checking the logs and i found these lines in maillog
postfix/smtpd[12135]: warning: hostname mta9.imxonlines.co.za does not resolve to address 91.212.150.89: Name or service not known
connect ...
- 41
1
vote
0
answers
1k
views
Postfix not sending mail but receive only in CWS
I am using a centos web panel and not able to send mail from postfix. But I can receive mail. I am getting the following error in a log file when I try to send mail from Roundcube
postfix.service - ...
- 111
1
vote
1
answer
8k
views
Connection closed by foreign host (postfix)
Tried to test my smtp server (centos server), I am using telet at centos
When I tried to test using code:
telnet 127.0.0.1 25
Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'.
...
0
votes
2
answers
3k
views
CentOS 7 fresh installation having trouble sending emails to gmail
I have just setup a small VPS on Vultr.com using CentOS 7 to serve a few Wordpress sites.
Apart from Nginx and PHP the server is completely fresh.
The Wordpress setup went fine except when trying to ...
- 299
2
votes
0
answers
529
views
Postfix transport based on source IP address (with or without relayhost)
We have Postfix relay server running on centOS 7.4.
Restricted source IP address by mynetworks cidr
mynetworks = cidr:/etc/postfix/allowlist.cidr
Now, I like to configure, some of the source ip ...
- 127
0
votes
2
answers
2k
views
Centos7 / Postfix / Dovecot not receiving external email
I'm setting up my personal email server, after a while I was able to send emails out with correct DKIM/SPF settings.
Right now i do not understand why I'm not able to receive email from external.
...
1
vote
2
answers
2k
views
Postfix tls errors with gmail as relayhost
while configuring a php contact form ive run into a bizarre issue where postfix refuses to send an email, I've narrowed the errors down to one and occasionally a second which.
The first is :
from /...
- 13
0
votes
1
answer
5k
views
550 No RDNS entry for my ip (in reply to RCPT TO command)
Some recipients are making RDNS verification to my mail server and being refused.
I have a CentOS VPS with my website and mail server for my business.
Is there anything wrong here? I can provice my ...
3
votes
3
answers
10k
views
Client did not present a certificate (Postfix)
I have postfix SMTP relay which have been configured with TLS option. Now just realized when sending email to gmail (for example) using Microsoft outlook,found out this "Client did not present a ...
- 127
2
votes
1
answer
6k
views
postfix tls not reading or finding key
I've been having issues sending mail to my server, and there are indications of TLS errors (mostly from the maillog).
What I've tried:
Ensuring that postfix / dovecot can read the certificates (made ...
user353390
0
votes
1
answer
76
views
In Postfix, how do I block sending emails to other domains while allowing forwarding of one email address?
I just installed PostFix on Cent OS 7. I want to set up mail forwarding from an admin address to my Gmail account but I also want to block all emails that are sent to emails that are not addressed to ...
- 224
0
votes
1
answer
6k
views
How do I set up an MX record to route mail to my CentOS 7 Postfix server?
I'm trying to set up mail forwarding from my CentOS Postfix mail server to my gmail account and I want to be sure I'm creating the MX records properly before troubleshooting my PostFix configuration. ...
- 224
2
votes
1
answer
696
views
Postfix gives error in maillog: maps_find: smtp_generic_maps: log: not found
I have changed the default FROM address of Postfix, from [email protected] to [email protected]
I can send the e-mails fine, but when I check the maillog file I then see some "not found" errors.
/etc/...
- 21
0
votes
0
answers
733
views
Getting maillog filling with bounce and non-delivery notifications that I don't understand or know how to prevent
Basic preview of my setup. I have a farm of centos 7.4 servers on private net all running postfix. They are all setup to send their mail via a postfix server setup as a mail relay (called proxy1).
...
- 1
2
votes
1
answer
3k
views
CentOS 7 Postfix - Dovecot Temporary internal error
Server is connecting with outside clients with success.
Autentication with success.
Sending emails with success.
The problem lies in the receiving.
The e-mails arive to the machine but I guess they ...
- 61