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The first thing you should do is check if your domain or IP is effectively crossed out as SPAM and included in a blacklist or blacklists.
To check if your domain or IP is blacklisted or multiple, I recommend the tool I use with my clients. This tool is called Blacklist Search (https://seonador.com/pesquisa-na-lista-negra). Once in it, you go to the blacklist and enter your domain or IP.
You go to the tool. Once there, you enter your domain or IP and click on Blacklist Check. As you can see in this image.
In this case, I used my own domain.
Check IP domain spam After clicking the button, a list of the most frequent blacklists will appear. Just by appearing in one of them, you are already fried and your campaigns will go to the SPAM tray.
Remember: If you use external email marketing managers, what might get blacklisted is your domain. On the other hand, if you installed a program for sending bulk emails on your servers, it could be your domain and IP. This second I never recommend. Best of all, you hire the services of reputable external email marketing managers such as Mailchimp, Mailrelay, Aweber, Getresponse, ActiveCampaign, and forget about managing them yourself. They are the experts at getting your message across.
Check IP domain spam in my case, following strategies, and of course permission, you can see that I am not listed on any blacklist.
My domain is not considered SPAM on the Internet because it follows a strategy designed and developed by and to add value and never bother my potential customers.
Also, each and every one of the emails I have in my database is 100% voluntary. Something important Remember to use best practices. You might not be listed or crossed out as SPAM right now, but it might not be anytime soon. We must prevent. Also, don't forget that people hate being sold. They must be the ones who find in you the only solution to their problems or needs and are eager to receive your campaigns.
Now I put the following case of a company that, ironically, is dedicated to marketing and that sends advertising to my mailbox without having asked.
I don't know this company at all. It's a simple example. Where will your campaigns end up? Logically to the SPAM folder and not because I sent them but because they are already listed and go alone.
It's ironic that this company is dedicated to marketing, right? If I put your domain in the tool, it seems to me that it is listed on many other blacklists.
Check IP domain spam Now, if you happen to have chosen the path of setting up your own email marketing manager on your servers (again I don't recommend it), in addition to putting your domain, you should also check your IP. As with the domain, a list will appear where you can see if this IP is included in a blacklist.
If your domain does not appear on any blacklist, I offer my heartfelt congratulations. Take care of your reputation. Remember it takes years to build it and minutes to lose it. Now, if your domain is included in any SPAM list, unfortunately, you can't do much. I certainly don't have a solution for this. I've heard that you can contact these lists and ask to be removed from them. Also, if you are in one, it is because you have done something wrong, consciously or unconsciously. Instead of looking for a way to erase "your bad practices," start changing your view of email marketing and "reforming."