Miscellaneous topics that do not fit into specific categories.
Hi,
Could you please share the full error message? Please hide email addresses and other personal information.
Does this affect all colleagues or only you, and do the affected recipients use Hotmail/Outlook.com or company email addresses?
If your company has an IT administrator or email provider, please also forward the delivery failure message to them so they can check your domain’s email authentication and any sending-server restrictions.