Frequently people ask me for clarification on the different sorts of IPs Marketo offers, and the pros and cons of each, so I thought I would write a post on it, and since I love analogies, that's what I am going to do here.
There are three kinds of IP that Marketo offers, shared, trusted, and dedicated.
Being on a shared IP is kind of like living in an apartment building. The upside is that it costs less than living in a house, but the downside is that you can be affected by the neighbors who share a roof and walls with you. If one neighbor throws a wild party, all the neighbors get to hear it. If someone starts a fire in their living room, the fire department evacuates everyone from the building, no matter who started it. Similarly, on a shared IP, if one of your neighbors hits a spam trap, then the entire IP and everyone on it suffers the consequences until the IP is delisted. If you get sick of having to deal with your neighbors in the Shared IP Apartments, what are your options?
One option would be to move to the Trusted IP instead. It's a shared IP range reserved for low-volumes instances with good marketing practices. It costs the same as the shared IP, but there's a application process to qualify and not everyone can get in. So it's kind of like living in an apartment that does a credit and reference check before letting you in and has a very strict on-site manager who evicts people who misbehave. The upside is, it's a nice, quiet place to live at no extra price, but on the downside, if you slip up, you may find yourself headed back to the Shared IP Apartments.
If you send more than 100,000 emails per month and you are done with "apartment living", you might want to spend the money to get your own house - a dedicated IP. With your dedicated IP house, you don't have to worry about whether or not the person on the other side of a wall has a loud party or leaves candles unattended, because you have the whole thing to yourself. Of course, you do have to spend a little extra on it, and if you leave a candle unattended and burn the place down, you have no one to blame but yourself.
If you are currently living in the Shared IP and want to make the make the move to Trusted, you must meet the following requirements: You must not be responsible for any spamtrap hits in the past year, you must send less than 75,000 emails per month, and you must adhere to best practices in your lead acquisition (opted-in leads and current customers, no purchased lists). You can find the application for Trusted IP here - https://na-sjg.marketo.com/lp/marketoprivacydemo/Trusted-IP-Sending-Range-Program.html.
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