For the past 3 weeks, messages sent to email@example.com are being rejected and returned with a message like this:
550 permanent failure for one or more recipients (firstname.lastname@example.org:blocked)
I work for a large university and we use Google as our e-mail service, yet messages are blocked. I also can't send mail from a subdomain within our main university domain that does not use GMail. We have a proper SPF record and the sending mail server is allowed to send per the SPF record.
I have contacted t-mobile support by phone multiple times but the staff answering the phone are not able to address or even understand the problem. Reading other similar posts here, I see that somehow you have to call in and get added to a 'approved sender' list. Can somebody tell me what number to call for support that would understand this issue?
Best answer by tmo_chris
This definitely sounds like your domain is getting blocked by our spam filters. We will need to speak with you over the phone for this but you can mention to the specialist you speak with to look at internal document DOC-414999 for all the info they will need to get a ticket submitted to have your domain unblocked.