I used gmail. Is there an easy way to make sure their email's dont get spammed? I tried MaxBulk mailer, but it didn't seem to agree with my verizon dsl set up. Any ideas? Shein Reviews
I understand very well your question as I got the same problem
I sent 139. emails grouped by 3. each 10 seconds. All but one have been sent But I receiver 40 mail delivery subsystem messages as mail rejected "Ofr 506. or 416. or 550 spam detected ???? "How can enter the right setting to avoid that catastrophe because as it is the logiciel is not matching my use (excuse me for my poor English as I am French)
If your message is rejected by Gmail as spam then the best you can do is to find out why getting a report. You can do this here: Test the Spammyness of your Emails.
Once you get your report try to do everything you can to get the better score.