Dev {Tricks}

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Hardening Postfix For ISPConfig 3

Reverse DNS, (DNS PTR Record)

You can check your rdns with the command host:

host YOUE-IP

SPF For Your Domain (DNS TXT Record)

Copy the spf result, then go to ISPConfig -> dns -> zones ->click on your domain name -> click on records tab -> and click on TXT

Hostname -> example.com. (with dot at the end!)

Text -> Paste here the spf result

Example:

v=spf1 a mx ptr ip4:YOUR.IP.ADDRESS -all

Click on Save.

Postfix main.cf

Let’s add/change something to /etc/postfix/main.cf

Helo restrictions:

smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname

Strict rfc:

strict_rfc821_envelopes = yes

Clients restrictions:

smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_client_hostname, check_client_access mysql:/etc/postfix/mysql-virtual_client.cf

Recipient restrictions:

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unknown_recipient_domain

Data restrictions:

smtpd_data_restrictions = reject_unauth_pipelining

Smtpd delay:

smtpd_delay_reject = yes

Reload postfix:

/etc/init.d/postfix reload

SPF Check For Postfix (Debian And Ubuntu)

Intstall spf package:

apt-get install postfix-policyd-spf-python

or

apt-get install postfix-policyd-spf-perl

Add this to /etc/postfix/main.cf :

policy-spf_time_limit = 3600s

and add check_policy_service unix:private/policy-spf at the end of smtpd_recipient_restrictions:

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination, reject_unknown_recipient_domain, check_policy_service unix:private/policy-spf

Now edit master.cf and add at the end this (for the python version):

policy-spf unix – n n – – spawn
user=nobody argv=/usr/bin/policyd-spf

or this for the perl version:

policy-spf unix – n n – – spawn
user=nobody argv=/usr/sbin/postfix-policyd-spf-perl

…reload postfix.

/etc/init.d/postfix reload

Greylist

Greylisting is a method of defending email users against spam. A mail transfer agent (MTA) using greylisting will “temporarily reject” any email from a sender it does not recognize. If the mail is legitimate the originating server will, after a delay, try again and, if sufficient time has elapsed, the email will be accepted.

Installing postgrey (Debian, Ubuntu):

apt-get install postgrey

The configuration options are in /etc/default/postgrey ( default delay is 5 min).

Edit main.cf and add check_policy_service inet:127.0.0.1:10023 to the end of smtpd_recipient_restrictions:

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination, reject_unknown_recipient_domain, check_policy_service unix:private/policy-spf,check_policy_service inet:127.0.0.1:10023

…reload postfix:

/etc/init.d/postfix reload

DNSBL (DNS Based Blacklist/Blocklist)

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ISPConfig Checklist

How to install ISPConfig 3

How to Update ISPConfig 3

Update Instructions

To install the latest ISPConfig update, run this command on the shell of the server as root user:

ispconfig_update.sh

The ISPConfig updater will then check for new releases and guide you through the update process.
A detailed update guide is available here

 

 

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Limit text lines of a div using CSS

<div class=”text-line-3″>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam consectetur venenatis blandit. Praesent vehicula, libero non pretium vulputate, lacus arcu facilisis lectus, sed feugiat tellus nulla eu dolor. Nulla porta bibendum lectus quis euismod. Aliquam volutpat ultricies porttitor. Cras risus nisi, accumsan vel cursus ut, sollicitudin vitae dolor. Fusce scelerisque eleifend lectus in bibendum. Suspendisse lacinia egestas felis.</div>

.text-line-3 {
overflow: hidden;
text-overflow: ellipsis;
display: -webkit-box;
-webkit-line-clamp: 2; /* number of lines to show */
line-clamp: 2; 
-webkit-box-orient: vertical;
}

 

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How to increase Google Scholar citation count?

Steps to increase Google Scholar citation count

  1. Scope of the article
    • Immediate impact on society.
    • Solve practical problems.
    • Overcome the challenges.
    • Introduce new technology.
  2. Linking evidence to the paper
    • Provide links to the supporting evidence.
    • Add relevant links in the references of a research paper.
  3. Keyword Selection
    • Select at least 4 keywords.
    • Repeat keywords throughout the paper including in the abstract, introduction, body, and conclusion.
  4. Title
    • Short and descriptive. Should be around 60 words, including the keyword related to the topic.
  5. Headings
    • Divide paper into a good number of paragraphs under proper headings. These headings should include keywords.
  6. Abstract
    • Include at least 4 to 6 keywords.
  7. Accessibility
    • Publish the paper in an open-access journal (OJS).
    • If ojs is not possible, post in a repository (DSpace).
    • Share widely. Twitter, Facebook, Instagram, etc.
  8. Self-citation
    • Can cite previous relevant and related papers in the present paper.
  9. Inclusion of tables and figures
    • Reliable graphical data like tables, figures, and a graphical abstract.
  10. Promotion of research papers
    • Promote work(s) among other scholars. Such scholarly websites are Science Direct, Research Gate, Kudos, etc.
  11. Collaboration with fellow authors
  12. Quality of the research paper
  13. Reusability
    • Revolving around the main idea. Other researchers can create another new piece of work.
  14. Original and effective
    • An original idea is effective. The paper should have experiments that are done practically with actual results.

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Plesk for Linux

Resending all deferred emails via Plesk interface

Go to Tools & Settings > Scheduled Tasks > Add Task.

/usr/sbin/postsuper -r ALL

Click Run Now.