The phrase "sent by express" can be altered by using some synonyms to convey the same message accurately. Some alternative phrases that may be used to convey the same idea include, 'sent via courier,' 'dispatched by special delivery,' 'forwarded by expedited service,' or 'shipped through an urgent service provider.' Each of these options can be used interchangeably to indicate that a package or item was sent in a prioritized manner, likely with an extra fee paid for the service. It's essential to use the correct synonym so that the recipient can identify the urgency of the package and receive the appropriate level of attention.