Problème de mails abusifs envoyés par mon serveur via ftp

Bonjour,
Je cherche une personne qui puisse m'ôter une épine du pied : mon hébergeur veut couper mon serveur car celui-ci envoie des mails abusifs via ftp.
Quelqu'un sait-il faire ?
Voici le message :

Dear Sir/Madam,

We have detected abuse from the IP address *.*.*.*, which according to abusix.com is on your network. We would appreciate if you would investigate and take action as appropriate.

Log lines are given below, but please ask if you require any further information.

(If you are not the correct person to contact about this please accept our apologies - your e-mail address was extracted from the whois record by an automated process.)

This mail was generated by Fail2Ban in a X-ARF format! You can find more information about x-arf at [URL visible pour les membres Pro]

The recipient address of this report was provided by the Abuse Contact DB by abusix.com. abusix.com does not maintain the content of the database. All information which we pass out, derives from the RIR databases and is processed for ease of use. If you want to change or report non working abuse contacts please contact the appropriate RIR. If you have any further question, contact abusix.com directly via email [Email visible pour les membres Pro]). Information about the Abuse Contact Database can be found here: [URL visible pour les membres Pro]
abusix.com is neither responsible nor liable for the content or accuracy of this message.

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Reported-From: [Email visible pour les membres Pro]
Category: abuse
Report-ID: [Téléphone visible pour les membres [Email visible pour les membres Pro]
Report-Type: login-attack
Service: pure-ftpd
Version: 0.2
User-Agent: Fail2ban v0.9
Date: Mon, 25 Jul 2022 04:47:22 +0200
Source-Type: ip-address
Source: *.*.*.*
Port: ftp,ftp-data,ftps,ftps-data
Schema-URL: [URL visible pour les membres Pro]
Attachment: text/plain
Occurances: 5
TLP: green

Note: Local timezone is +0200 (CEST)

[Téléphone visible pour les membres Pro]T04:47:[Téléphone visible pour les membres Pro]web-002.webh.cloud pure-ftpd[267976]: (?@*.*.*.*) [WARNING] Authentication failed for user [anonymous]