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I want so say hello to multiple email addresses(20+). Is it possible to do this without showing to each people that the email was sent also to other 19 email addresses?

If not possible, is there any web application or software which can do this?

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put on hold as off-topic by Stephen Ostermiller♦ 4 mins ago

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions asking for recommended external websites, tools, resources, and software are off-topic as they tend to attract opinionated answers and spam. Recommendations for software are permitted on Software Recommendations, but be sure to read their quality guidelines before posting there." – Stephen Ostermiller
If this question can be reworded to fit the rules in the help center, please edit the question.
    
This is off-topic because it is asking for web app recommendations. It is also off-topic here because it is asking about how to use Gmail and not about how to run your own website. – Stephen Ostermiller♦ 3 mins ago
    
It also appears that you cross-posted this question to multiple StackExchange sites: webapps.stackexchange.com/questions/100540/… Please do not do that. – Stephen Ostermiller♦ 2 mins ago