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Sendinblue SMTP server recommendation.
I was struggling with using Gmail smtp but I continued searching and found Sendinblue. Pretty easy to set up and you get up to 300 emails per day, since this is a personal project I'm working on, I'm fine with that. Email verification works perfectly for me now. if you're interested you can check it out: https://sendinblue.com
TL;DR
I was having trouble with Gmail SMTP, but I found Sendinblue which is easy to set up and offers up to 300 emails per day. Email verification works well with it. You can check it out at https://sendinblue.com. 