swaks is a command line SMTP testing tool available at http://www.jetmore.org/john/code/swaks/ On Debian/Ubuntu, you can install it with
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apt install swaks |
if you just type swaks, it will ask your email, then sent a mail using MX Record to specified email address. To send email using specific mail sevrer
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swaks --to user@example.com --server test-server.example.net |
Deliver a standard test email, requiring CRAM-MD5 […]
To generate DKIM, go to https://www.sparkpost.com/resources/tools/dkim-wizard/ On first text box, enter the domain name that you will be sending email from. For example, if i need to sent email from [email protected], i need to enter serverok.in in this text box. In DomainKey Selector text box, enter name for your DKIM key. This can be any […]
To change SMTP port in PowerMTA, edit file
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vi /etc/pmta/config |
Find line starting with
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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.
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smtp-listener 0/0:2525 smtp-listener 0/0:25 |
This will […]
Once you have PowerMTA installed, you need to create SMTP user. To create an SMTP user, edit file
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vi /etc/pmta/config |
Find
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#<smtp-user API> # password "changeme" #</smtp-user> |
Add below
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<smtp-user SMTP_USERNAME_HERE> password "SMTP_PASSWORD_HERE" source {smtpuser-auth} </smtp-user> <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 </source> <virtual-mta vmta-1> #smtp-source-host 79.137.44.176 smtp1.serverok.in #domain-key default,smtp1.serverok.in,/etc/pmta/default.smtp1.serverok.in.pem <domain *> max-msg-rate 100/h </domain> </virtual-mta> |
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 […]
Exim comes with a utility called “exiwhat” which will display what each instance of exim is currently involved with.
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exiwhat |
The output will look similar to this To monitor the exim log in realtime, you may use the tail command
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tail -f /var/log/exim_mainlog |
See Exim, exiwhat […]
To stop spam using RBL in postfix, edit main.cf
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vi /etc/postfix/main.cf |
Add
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smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_invalid_hostname, reject_unauth_pipelining, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.spamcop.net, reject_rbl_client sbl.spamhaus.org, reject_rbl_client zen.spamhaus.org, permit |
Restart postfix
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systemctl restart postfix |
See postfix […]
To enable postfix, run
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postconf -e "home_mailbox = Maildir/" systemctl restart postfix |
You can do it by editing /etc/postfix/main.cf
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vi /etc/postfix/main.cf |
Add
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home_mailbox = Maildir/ |
if home_mailbox entry already in main.cf file, then modify instead of adding a new entry. Virtual Mailbox If you are using virtual mailbox, make sure you spedify folder in your virtual_mailbox_maps. Here is what i have in main.cf
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virtual_mailbox_maps = hash:/etc/postfix/vmailbox |
in […]
On a CentOS server, when sending mail from PHP scripts, mail failed to work. On checking postfix log file (/var/log/maillog), i see following error.
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Aug 11 01:41:53 forums postfix/sendmail[44463]: fatal: open /etc/postfix/main.cf: Permission denied |
To fix this, disable selinux
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setenforce 0 |
To permanantly disable SELinux, run
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sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config |
[…]
On an Ubuntu Server, i done following to setup email forwarding. Install postfix
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apt -y install postfix |
Edit /etc/postfix/main.cf, add following
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vi /etc/postfix/main.cf |
Add
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virtual_mailbox_domains = YOUR-DOMAIN_HERE.com virtual_mailbox_base = /var/mail/vhosts virtual_mailbox_maps = hash:/etc/postfix/vmailbox virtual_minimum_uid = 100 virtual_uid_maps = static:5000 virtual_gid_maps = static:5000 virtual_alias_maps = hash:/etc/postfix/virtual |
Create Virtual mailbox
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vi /etc/postfix/vmailbox |
Add
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user1@YOUR-DOMAIN_HERE.com YOUR-DOMAIN_HERE.com/user1 |
Create alias file, used for mail forwarding
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vi /etc/postfix/virtual |
Add
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admin@YOUR-DOMAIN_HERE.com YOU@gmail.com |
Wth above configuration, mail coming to [email protected]_HERE.com will get forwarded to [email protected] Email coming to [email protected]_HERE.com get delivered […]
iRedMail allow you to run your own mail server easily. It use postfix mail server for mail delivery. https://www.iredmail.org/ iredmail increase mail attachment size […]