Incoming mail generally continues to reach inmates in the hole, which is the common term for disciplinary segregation or the SHU. Mail access is one of the privileges that survives most SHU placements and a letter sent through InmateAid travels through the facility's standard mail system the same way any other letter does. It goes to the mailroom, gets screened, and gets delivered to wherever the inmate is currently housed including segregation.
That said, delivery may be slower than usual. Mail runs to segregation units operate on a different schedule than general population and there can be a lag between when a letter arrives at the facility and when it actually reaches the inmate's hands.
On the outgoing side, an inmate in the hole can still write letters and send them out through InmateAid but access to the materials needed to do so may be more limited than in general population. Paper, envelopes, and stamps have to be requested through staff rather than being readily available through commissary. If the SHU placement came with additional restrictions on commissary access that affects the ability to purchase writing materials independently.
If your loved one wants to respond through InmateAid they simply write their letter on paper and mail it to the InmateAid address the same way they would from any housing unit. The process does not change based on where they are housed inside the facility.
The one exception to keep in mind is if a specific mail restriction has been imposed as part of the disciplinary consequence rather than just standard SHU limitations. That is less common but worth confirming with the facility if letters stop getting through entirely.
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