PTR record maps an IP address to a domain name. Tip #1: Reject Email if SMTP Client Has no PTR record So here comes my 7 tips, which will block 90% of spam.įact: Around 93%~95% of emails in the world are rejected at the SMTP gateway, never landed in the inbox or spam folder. Legitimate email servers should never have these characteristics. They generally don’t re-send email after a failed email delivery.The spammer doesn’t provide valid hostname in HELO/EHLO clause.Their IP addresses don’t have PTR records.Characteristics of Spamīelow is what I found about email spam. If you prefer to set up a mail server from scratch, then check out my mail server tutorial series. Note: If you plan to run your own mail server, I recommend using iRedmail, which really simplifies the process of setting up a mail server. This post is the result of my experience in fighting spam. Postfix allows you to block spam before they get into your mailbox, so you can save bandwidth and disk space. Spam exists because it’s so cheap to send a large volume of emails on the Internet. Over the last four years of running my own email server, I received lots of spam, aka unsolicited commercial email, most of which came from China and Russia. In this tutorial, I’d like to share with you my 7 tips for blocking email spam with Postfix SMTP server.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |