Hello, I use Mailchimp for a daily newsletter in Germany. A lot of my customer use a mail-account at t-online.de Since 20.8.2015 I can't sent any newsletters to them. The do not go into spam, they don't bounce, they just disappear. No problems with any other mail-provider. And t-online is of no help („look at the side of the sender, ...") Any suggestions? Thanks.
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