I'm going to start a cold emailing campaign with an few years old @gmail account. Until now I've been using Gmass, but the 50 emails limit got too tight. I plan to send about 1000 emails/day.
1. Should I add an SMTP with rotating IP and tracking domain Gmass to maximise my chances?
2. Should I change GMass with any other tool like Sendinblue?
3. Until now I got rejected with the error "554 5.7.1 Spam message rejected" only by one address, but does this mean that my @gmail account is now flagged and therefore useless?
Thanks everyone
1. Should I add an SMTP with rotating IP and tracking domain Gmass to maximise my chances?
2. Should I change GMass with any other tool like Sendinblue?
3. Until now I got rejected with the error "554 5.7.1 Spam message rejected" only by one address, but does this mean that my @gmail account is now flagged and therefore useless?
Thanks everyone

