How to use authorization in sending mails, as we know there
is lot of spammers and phishers which exploit Mail Servers daily and not only
this if you are sending Bluck Mails to your clients having mail ids in
different domains (yahoo, gmail, hotmail etc) in most cases your mail will land
on spam or junk, so to avoid these things we can implement SPF and DKIM.
First lets understand what is SFP and DKIM
Sender Policy Framework (SPF) is an email validation system
designed to prevent email spam by detecting email spoofing, a common
vulnerability, by verifying sender IP addresses. SPF allows administrators to
specify which hosts are allowed to send mail from a given domain by creating a
specific SPF record (or TXT record) in the Domain Name System (DNS). Mail
exchangers use the DNS to check that mail from a given domain is being sent by
a host sanctioned by that domain's administrators.
Domain Keys: DKIM embeds a cryptographic signature to e-mail
messages and an indication of which DNS entry to examine. The receiving server
can then look up the DNS entry and use the data it finds to verify the
signature.
And to generate DKIM signature you can use this URL and if you are concerned
about your Keys may be misused by above URL then you can generate DKIM Keys
through OPENSSL to do this you can follow the steps from this Website
I hope this will help you out from some spamming frustration
and there is another thing we can implement that is DMARC (Domain-based Message
Authentication, Reporting & Conformance), we will talk about this in coming
post....
