Be warned, It's illegal to use a service like this to promote your products or services. It's against CAN-SPAM in the US, GDPR in the EU, PECR as well in the UK. Facilitating this is also illegal. - Processing and tracking user personal data without informing them - not giving them a way to opt-out. - Hiding the details of your company Furthermore, it would be impossible to effectively manage reputation with this system since Gmail's algorithm has over 200 data points it looks at, and looks heavily at IP, domain and sender profile. No algorithm can overcome those challenges.

Weird. Dangerous. As a recipient, it strongly looks like a sender that I would block. As a professional it's a service I would never recommend to my client since it's illegal in Europe. What is your target market exactly?

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I don't think someone can abuse this service or use this to send spam. because if you use this service you can see, the recipient has a direct option to unsubscribe from the service. also, the sender cannot send bulk emails or send emails continuously. after his 1st email, he has to wait for 10 minutes after his 2nd email, he has to wait 1 hour after his 3rd email, he has to wait 1 day and also we do a thorough check on the email body to prevent malicious uses of the service. for everyone who asked for the use case of this service: have you ever wanted to send an email whenever you haven't access to your personal mailbox? within your working environment, have you ever wanted to send an email without revealing your identity like reporting someone's act, etc? this is where you can use this service. you cannot use this service to advertising, spam, marketing, etc. You cannot do marketing by sending one email per day. a quick tip: use your gmail to send 500 emails per day with options like bcc and cc.

I have used this service so many times. I like it but how to avoid spam?

Hmm… I honestly can’t see anyone using is without any malicious thought. Just saying.