Any Brevo admins with t-online.de customer emails

Hi, I am looking for people who use Brevo and have customers in the DACH region with t-online email addresses? We are currently looking into Brevo to replace our existing email marketing tool, that has delivery issues with t-online.de email addresses and want to make sure, this same issue does not prevail with Brevo. Can anyone help me with insights?

thank you
Niki