Sender IDs to Ukraine can be modified to ensure the delivery.
25507 - TriMob generic alpha senders are not allowed, therefore you must use alpha sender IDs to send traffic here, ideally your company name.
25506 - Astelit, please get in touch with your Account Manager to ensure that the Sender ID can be supported or email firstname.lastname@example.org to set this up.
There are no additional content restrictions beyond those in our Acceptable Use Policy
Other features/restrictions of note:
Handset delivery receipts are supported.