Customer service unavailable?

After sending a message about a problem I encounter via iPados-App to customer@logos.com I got the following answer that the Email could not be delivered. What shall I do?
This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address failed: customerservice@logos.com: SMTP error from remote server for RCPT TO command, host: logos-com.mail.protection.outlook.com (52.101.9.20) reason: 550 5.7.1 Service unavailable, Client host [82.165.159.42] blocked using Spamhaus. To request removal from this list see https://www.spamhaus.org/query/ip/82.165.159.42 AS(1440) [BL02EPF00021F6E.namprd02.prod.outlook.com 2025-05-23T13:24:22.015Z 08DD99B1E88EC3FB]
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Try cs@logos.com
As far as I know "customer@logos.com " and "customerservice@logos.com" aren't valid e-mails.
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Thanks DMM! I will try it directly via e-mail app.
However, the iPadOS Logos-App sends the message to the mentioned e-mail adresses.
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I send you a screenshot…
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After some review, the customer support contact email address is in good working condition, but your email is being picked up and flagged by spam filters, possibly because of the VPN you are using or where it is you are sending your email from.
Sr. Community Manager at Logos.
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Thanks for the response, Jason!
I wil try switching off the VPN.0