Category: PowerMTA

How to configure Hostname in PowerMTA
By default, PowerMTA uses the server’s hostname. You can specify a custom hostname per Virtual MTA.

To set a hostname for VitualMTA, add host-name entry as follows.
```
    host-name smtp1.serverok.in
    #domain-key default,smtp1.serverok.in,/etc/pmta/default.smtp1.serverok.in.pem
    
    max-msg-rate 100/h
    
```
February 3, 2022

Install PowerMTA

Install the requirments

yum install unzip net-tools telnet git gdb -y

If you already have a mail server remove it.

yum remove postfix -y

If you want to keep current mail server, you can run PowerMTA on a port other than 25.

cd /root/PMTA/
unzip PowerMTA5.0r1.zip
cd /root/PMTA/PowerMTA5.0r1
yum install PowerMTA-5.0r1-201909161531.x86_64.rpm
service pmta stop
service pmtahttp stop
rm -f /usr/sbin/pmtad
rm -f /usr/sbin/pmtahttpd
cd  /root/PMTA/PowerMTA5.0r1/usr/sbin
cp * /usr/sbin
chmod -R 755 /usr/sbin/pmta
chmod -R 755 /usr/sbin/pmtad
chmod -R 755 /usr/sbin/pmtahttpd
cp /root/PMTA/PowerMTA5.0r1/license /etc/pmta

Restart PowerMTA

service pmta start
service pmtahttp start

If you get any error, run powermta in debug mode

pmtad --debug

To customoize your PowerMTA install, edit config file

vi /etc/pmta/config

After editing config file, you need to restart PowerMTA

service pmta restart

Or reload, which is faster

service pmta reload

See PowerMTA

December 16, 2020

PowerMTA test using telnet

To test PowerMTA using telnet, run

telnet localhost 25

Now paste following content

ehlo localhost
mail from: [email protected]
rcpt to: [email protected]
data
Subject: Testing

This is text email.
.
quit

To see logs

tail -f /var/log/pmta/pmta.log

To see PowerMTA queue, run

pmta show queues

See PowerMTA

December 16, 2020

PowerMTA IP Rotation

To setup IP rotation in PowerMTA, configure multiple IP on the server. Setup rDNS for each of these IP, point a sub domain to these IPs same as the reverse DNS entry.

Here is an exable

First we need to edit DNS records. Add folowing A records.

pmta1.sevrerok.in    A       176.123.8.12
pmta2.sevrerok.in    A       176.123.8.13 
pmta3.sevrerok.in    A       176.123.8.17

Set up rDNS (reverse DNS/PTR Record) with your server provider.

176.123.8.12 > pmta1.sevrerok.in
176.123.8.13 > pmta2.sevrerok.in
176.123.8.17 > pmta3.sevrerok.in

Edit PowerMTA config file

vi /etc/pmta/config

Find your virtual-mta configuration, replace it with


    smtp-source-host 176.123.8.12 pmta1.sevrerok.in
    domain-key default,*,/etc/pmta/default.sevrerok.in.pem
    
    max-msg-rate 400/h
    



    smtp-source-host 176.123.8.13 pmta2.sevrerok.in
    domain-key default,*,/etc/pmta/default.sevrerok.in.pem
    
    max-msg-rate 400/h
    



    smtp-source-host 176.123.8.17 pmta3.sevrerok.in
    domain-key default,*,/etc/pmta/default.sevrerok.in.pem
    
    max-msg-rate 400/h
    



    virtual-mta pmta1
    virtual-mta pmta2
    virtual-mta pmta3

See PowerMTA

December 16, 2020

PowerMTA route mails through another SMTP server for a domain
If you want to route emils from PowerMTA though another SMTP server, you can use following config.

In this example, all outgoing emails to @outlook.com domain will get routed through Amazon SES.

Edit PowerMTA config file
```
vi /etc/pmta/config
```
Add folowing
```
    queue-to amazon-ses.route



    auth-username USER_NAME_HERE
    auth-password PASSWORD_HERE
    route email-smtp.us-west-2.amazonaws.com:587
    use-starttls yes
    require-starttls yes
```
Restart PowerMTA
```
systemctl restart pmta
```
See PowerMTA
December 13, 2020
Enable Web Monitor UI in PowerMTA
PowerMTA comes with a Web Monitor UI, that will show you some stats about your mail server, also able to run some commands, edit PowerMTA configuration file.

To enable Web Monitor UI, you need to white list your IP address in PowerMTA configuration, for this you need a fixed IP Address.
```
vi /etc/pmta/config
```
Find
```
http-access 127.0.0.1 monitor
http-access ::1 monitor
```
Add below
```
http-access 51.38.246.115 admin
```
Replace 51.38.246.115 with your IP address in above line and restart PowerMTA.
```
systemctl restart pmta
```
Now you will be able to access PowerMTA Web Monitor UI at

https://YOUR_MAIL_SERVER_IP:8080/

Web Monitor log file
```
tail -f /var/log/pmta/pmtahttp.log
```
See PowerMTA
December 13, 2020

PowerMTA allow an IP to sent email

To allow a web server to send email through PowerMTA with out autentication, you need to edit PowerMTA configuration file

vi /etc/pmta/config

Add a source entry for the IP address that you need to allow relaying mails


    always-allow-relaying yes
    smtp-service yes

Replace IP_ADDRESS with IP address of web server that you need to allow sending email with out autentication.

Restart PowerMTA

systemctl restart pmta

With out source entry, if you try to sent email, you will be rejected with error “550 5.7.1 relaying denied for recipient”.

Example using swaks

root@lab:~# swaks --to [email protected] --server smtp1.serverok.in --port 2525
=== Trying smtp1.serverok.in:2525...
=== Connected to smtp1.serverok.in.
<-  220 smtp1.serverok.in ESMTP service ready
 -> EHLO lab.serverok.in
<-  250-smtp1.serverok.in says hello
<-  250-ENHANCEDSTATUSCODES
<-  250-PIPELINING
<-  250-CHUNKING
<-  250-8BITMIME
<-  250-AUTH CRAM-MD5
<-  250-AUTH=CRAM-MD5
<-  250-XACK
<-  250-SIZE 0
<-  250-VERP
<-  250-SMTPUTF8
<-  250 DSN
 -> MAIL FROM:
<-  250 2.1.0 MAIL ok
 -> RCPT TO:
<** 550 5.7.1 relaying denied for recipient in "RCPT TO:"
 -> QUIT
<-  221 2.0.0 smtp1.serverok.in says goodbye
=== Connection closed with remote host.
root@lab:~#

See PowerMTA

December 13, 2020

Create DKIM in PowerMTA

To generate DKIM, run the command

openssl genpkey -algorithm RSA -out private.pem
openssl rsa -pubout -in private.pem -out public.pem

This will create 2 files. private.pem and public.pem

Create a file and copy the content of the file private.pem in it.

/etc/pmta/DOMAIN_NAME_HERE.pem

Public Key

The file public.pem contains the public key, which you need to put in your DNS zone.

public.pem file contains something that looks like the following.

NOTE: This is just an example, don’t use it.

You need to remove —–BEGIN PUBLIC KEY—– and —–END PUBLIC KEY—–, and remove line chars, so it looks like one long string. For example

MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuTt4sgLkVtp3kFkOFcjl gFbl+62iqhhDSmNosLqW0Pna+rhyBUpPxtCingTi1IO6/vd9MCaTRe89gyTVy8QD gfERopy+uR3MVrpmHhvaAlqH++HIpJDl/y5PuQz/VRL6bUy6jM0TMmqrEWLUORuc JcuBP7p7Vwu+cNPuf962YblCqKj5qQlSNPiqVoQvZPYmj6mAvFg0/3dHVcP4j3rC gfLhSNzBKiQgewkUXoclT8209vGG82ER8nCMwBm16WfCHSAjEmKGAQ01xS32toiZ Khti9zKgrR2J6kbijMLB2ONQ0gvvbcwRgoJQQ5CkemAGlfsIhEvlfXbD0lkM5PwV vQIDAQAB

Next, you need to edit the DNS record for your domain name. Create a TXT record with the following name

default._domainkey.DOMAIN_NAME_HERE

For the value, use

"v=DKIM1; k=rsa; p=PUBLIC_KEY_HERE"

Example

"v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuTt4sgLkVtp3kFkOFcjl gFbl+62iqhhDSmNosLqW0Pna+rhyBUpPxtCingTi1IO6/vd9MCaTRe89gyTVy8QD gfERopy+uR3MVrpmHhvaAlqH++HIpJDl/y5PuQz/VRL6bUy6jM0TMmqrEWLUORuc JcuBP7p7Vwu+cNPuf962YblCqKj5qQlSNPiqVoQvZPYmj6mAvFg0/3dHVcP4j3rC gfLhSNzBKiQgewkUXoclT8209vGG82ER8nCMwBm16WfCHSAjEmKGAQ01xS32toiZ Khti9zKgrR2J6kbijMLB2ONQ0gvvbcwRgoJQQ5CkemAGlfsIhEvlfXbD0lkM5PwV vQIDAQAB"

Enable DKIM Signing

To enable DKIM signing, edit

vi /etc/pmta/config

Add

domain-key default,serverok.in,/etc/pmta/default.serverok.in.pem

You can also add this in virtual MTA settings.

See PowerMTA

December 12, 2020

Change SMTP port in PowerMTA
To change SMTP port in PowerMTA, edit file
```
vi /etc/pmta/config
```
Find line starting with
```
smtp-listener
```
This line specify port used by PowerMTA server. You can change the power on this line. If you need PowerMTA listen to multiple ports, duplicate the line and change port, this will make PowerMTA work using both ports.
```
smtp-listener 0/0:2525
smtp-listener 0/0:25
```
This will make PowerMTA work on both port 25 and port 2525

After editing /etc/pmta/config, you need to restart PowerMTA with
```
systemctl restart pmta
```
See PowerMTA
December 12, 2020

Create SMTP user in PowerMTA

Once you have PowerMTA installed, you need to create SMTP user. To create an SMTP user, edit file

vi /etc/pmta/config

Find

#
#    password "changeme"
#

Add below


    password "SMTP_PASSWORD_HERE"
    source {smtpuser-auth}



    smtp-service yes
    always-allow-relaying yes
    require-auth true
    process-x-virtual-mta yes
    default-virtual-mta vmta-1
    remove-received-headers true
    #add-received-headers false
    hide-message-source true



    #smtp-source-host 79.137.44.176 smtp1.serverok.in
    #domain-key default,smtp1.serverok.in,/etc/pmta/default.smtp1.serverok.in.pem
    
    max-msg-rate 100/h

In above code, replace SMTP_USERNAME_HERE and SMTP_PASSWORD_HERE with SMTP username and password you need.

in vmta-1, domain-key line that is commented out is used to Enable DKIM signing of out going emails.

Resatrt PowerMTA

systemctl restart pmta

See PowerMTA

December 12, 2020

PowerMTA
PowerMTA is a highly configurable mail server for email marketing. Unlike general email servers, PowerMTA can be configured to meet your special mail delivery requirements.
List mails in the queue
```
pmta show queues
```
To reload PowerMTA
```
pmta reload
```
PowerMTA config file location
```
/etc/pmta/config
```
To see mail queue status, run
```
pmta show status
```
January 23, 2019