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Fast SSL Certificates – Products

Fast SSL Certificates – Products

This is the listing of famous public certification authorities. You can get certificate of your own choice. Compare pricing of different SSL vendors.

What is SPF (Sender Policy Framework) text record?

SPF – Sender Policy Framework. SPF is a TXT Record with some text in it. Usually SPF looks like this:
v=spf1 mx ~all, the meaning of tags you can see at Since it’s just a TXT record and publicly available, it was created for Anti-Spam software to be used. If a domain doesn’t have this record, and you send an email from this domain, most likely your email will go into SPAM/Junk folder and not inbox. Basically there are more and more features being invented to prevent spam senders and this one helps a little prove that the domain you are sending emails from is yours. It became so popular that now, other than TXT record, there is a special SPF record on DNS. We don’t create it for all clients. Nowadays mostly all spammers found a way to go around SPF anyway, so there are more things being created to prove that YOU were the sender of the email and not spammer. One of the new things is DKIM…to-SmarterMail used via TXT record too, but rather than just plain text like SPF, DKIM is encrypted, hashed and looks like this:

What is DNS text record (TXT) and its purpose?

It’s like a public notepad for each domain on DNS. Public is because it’s publicly available what’s written in DNS for this domain. Different companies and services can use TXT record for their purposes. TXT record doesn’t affect the domain’s availability (A record) or email availability (MX record). TXT record is really like a public notepad. One of the purposes often TXT record used is to identify that a client owns the domain. For us, it’s easy we can access account and dns ourselves, but what if a 3rd party company wants to know if this domain is YOURS. They provide some code and ask you to create a TXT record on your domain and put this code (or any text) in there. Once you added the text, they can read it off because it’s public information. This proves you have access to the domain’s dns and most likely own or manage the domain. Second most popular use for TXT is SPF.

Static IP vs Dedicated IP

There has been a lot of confusion between static and dedicated IP addresses. Today I would like to discuss this issue.

There are two types of IP addresses Dynamic and Static. Dynamic is the IP address that everyone receives automatically via DHCP server on home routers, wifi hot spots, etc. Basically anywhere you connect wirelessly or via cable and get internet connection automatically you get a dynamic IP address. Dynamic IP address can change when you connect next time. Servers cannot work with random IP addresses changes so we configure Static IP address on each server. So ALL servers have static IP addresses at all times. Static IPs cannot change randomly and assigned on a network card of each server. There can be more than one static IP address assigned to same server.

Shared Web Servers usually have a few IP addresses. By default all domains are assigned to just one IP address and all clients share this one IP address which makes this IP address a Shared IP. Technically it is possible to assign many domains to same IP address via binding in Internet Information Services (IIS7) and host headers in IIS6. Once a client wants to assign a SSL Certificate to his/her domain, shared binding/host headers are not possible anymore, so there is a requirement for a Dedicated IP. Once a dedicated IP is assigned to client’s domain, he/she is able to assign a SSL Certificate. The IP is now Dedicated to the client’s domain. The domain is no longer on a Shared IP address. Both Shared and Dedicated IP addresses are Static.

So it is incorrect to request a Static IP address from a web hosting company because all IP addresses are always static on all servers. Clients need to request a Dedicated IP address.

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