http://efa.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/toolkits/building-coalitions
In emails, provide clear links to the current draft of the letter and the registration sign-up; in email threads, you may need to remove links to old drafts. Always approach large organizations early. Large organizations may have slower decision-making processes. A large organization may also request slight changes to your guiding principles; you'll have to weigh these requests on a case-by-case basis, and inform previous signers of all changes and with the updated draft.