Make the first sentence usable
Lead with the reason for writing so the recipient does not have to decode a long emotional introduction. For a message about how to reconnect with a former volunteer team, use this factual base: name the group, your earlier role, why you left, and the current point of contact you found.
Reduce the work of responding
Offer simple options, a narrow question, or a clear update that can be understood without another conversation. Ask whether rejoining or visiting is appropriate and follow the group's present process. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Respect the boundary already visible
Do not claim an old role, skip current rules, or pressure a volunteer to resolve historic conflict privately. Use safeguarding and formal leadership channels for discrimination, abuse, threats, or vulnerable members. A block, explicit refusal, legal restriction, or safety plan takes priority over the desire to explain more.