I send bulk text msgs as e-mails to a large group. It works very well, but texts to t-mobil users don't go through. Why not?
Need to see if there is an issue with e-mails to addressed t-mobil format (********@tmomail.net). They come back with the message "550: permanent failure for one or more recipients (*******@tmomail.net:blocked)".
The error 550 indicates that the recipient has configured their account, possibly inadvertently, to only accept mail from certain addresses and/or domains. The recipient will have to change their mail settings in order to receive mail from you. AOL cannot override these settings.