Rainloop will not send nor receive mail


My rainloop app will not receive nor send mail. Any ideas what is wrong.

This is the response from the mail server.

This is the mail system at host xxxx.nohost.me.

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

xxxxxx@hotmail.com: host
hotmail-com.olc.protection.outlook.com[] said: 550 5.7.1
Service unavailable, Client host [xx.xx.xxx.142] blocked using Spamhaus. To
request removal from this list see
https://www.spamhaus.org/query/ip/[xx.xx.xxx.142] (AS3130).
[HE1EUR04FT013.eop-eur04.prod.protection.outlook.com] (in reply to MAIL
FROM command)

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