Hi @marinow1991,
Thanks for reaching out and we’re sorry to hear that you’re having issues with sending emails to a Hotmail email address.
I see that you created a follow-up thread here, but I’ll reply there soon and mark it as resolved as we’ll be continuing in this one instead.
Just to confirm are you getting an error message when sending to Hotmail email addresses in general or just that specific one? Also, where exactly did that error message from your screenshot appear?
Please try sending a test email from?WP Mail SMTP > Tools (here’s a screenshot for the option to get a full error log:?https://a.supportally.com/3Hc3lq), then you can go ahead and share those details in case any other specific errors appear.
Lastly, are you able to reproduce this issue when using any of our other mailers? If you have not tried this yet, you can find the full instructions for setting up our mailers in this section of our documentation.
I hope this helps! If you have any questions, could you please let me know?
Thanks! ??