All senders to Safaricom will be overwritten to a fixed alpha to ensure delivery. If you have very large volumes of 2FA traffic to send to Safaricom please get in touch with your account manager.
There are no additional content restrictions beyond those in our Acceptable Use Policy
Other features/restrictions of note:
Delivery Receipts are supported except for Airtel, where they are network receipts rather than handset receipts. There are substantial DLR Delays from the Kenya operators at most times so DLR latency should not be used to measure delivery time.