Oulook.com pbms?

hi, since this morning (?) I have some pbm to send mail to outlook.com (hotmail.fr, …)
with the answers :

host eur.olc.protection.outlook.com[52.101.73.5] said:
550 5.7.1 Unfortunately, messages from [135.181.139.185] weren’t sent.
Please contact your Internet service provider since part of their network
is on our block list (S3150).
or
host eur.olc.protection.outlook.com[52.101.68.24] said:
550 5.7.1 Unfortunately, messages from [135.181.139.185] weren’t sent.
Please contact your Internet service provider since part of their network
is on our block list (S3150).

host eur.olc.protection.outlook.com[52.101.68.33] said:
550 5.7.1 Unfortunately, messages from [135.181.139.185] weren’t sent.
Please contact your Internet service provider since part of their network
is on our block list (S3150).
and
host outlook-com.olc.protection.outlook.com[52.101.10.15] said: 550 5.7.1
Unfortunately, messages from [135.181.6.248] weren’t sent. Please contact
your Internet service provider since part of their network is on our block
list (S3150).

Any ideas ?
thanks.
Arnaud
Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online servicesphone

J ai le meme probleme !
Same problem !

host eur.olc.protection.outlook.com[52.101.73.10]
said: 550 5.7.1 Unfortunately, messages from [135.181.6.248] weren’t sent.
Please contact your Internet service provider since part of their network
is on our block list (S3150). You can also refer your provider to

postmaster@ecloud.global semble bloque par outlook

Olivier

May be related to Microsoft announces new email requirements for bulk senders - Red Sift Blog ?
@Manoj for admins eyes