Deliverability
Deliverability advice: Personalize the sender domain name
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Have you ever heard of identity theft? These people will steal someone's identity in order to subscribe to various services, such as an application for credit or mobile phone subscriptions.
Is this practice acceptable? The answer is obviously no!
In the world of email marketing, it's the same thing. Why should an email service or ISP agree to receive emails sent from the address igor3333@gamail.com if all the links in your email go directly to the website www.mycompany.ext?
It's a question of consistency. One of the criteria used to classify your email as spam or not is the consistency of your communication. If your identity as a sender is not consistent, you will receive a negative rating, which will be added to other criteria used to measure your reputation.
Conclusion: Use your website's domain name in your sender email address.