Blend the posts within the fence line using a consistent pattern. For example, use a T-post for every other line post or two T-posts between each galvanized post. Actual spacing for either type of post depends on the condition of the ground and the type of fencing you plan to use. However, the maximum spacing for galvanized posts is 10 to 15 feet apart. Using both types of post can reduce the overall cost of your fence. You may sacrifice visual appeal, but where your fencing is hidden from view or used for function rather than form, an attractive fence may be less important.
Adapt the hardware to help fit the type of fence material you plan to use to the posts you choose. For example, you can use malleable fence clips or fence ties made for attaching chain-link fence to galvanized posts to hook to fencing to T-posts with a bit of reshaping.
Use galvanized posts as terminal posts. Terminal posts are end, corner and gate posts. These are usually larger in diameter than line posts because they bear more weight and are often set in concrete for that reason. Galvanized posts used as terminal posts will anchor stretched mesh and chain-link fencing. T-posts are not made to handle the load of stretched wire. The posts may bend and warp or begin to lean in soft ground.