Electronic notice service validates meeting notices when transmitted with recipient confirmation and retained proof of sending. Regulation 20 requires electronic service of meeting notices by e-mail as text, attachment or link, with the subject identifying the corporate debtor, place, time and date. Non-editable attachments must be in PDF or equivalent and include software download instructions if needed. Notices accessible by link must be readable and downloadable, with full access details provided. The resolution professional must use a system generating recipient confirmations and retain records including failed transmissions as proof of sending; their obligation is met on transmission and they are not liable for failures beyond their control. Non-updated creditor e-mail addresses do not invalidate meeting decisions.