The message never went out.
CHECK THE PLATFORM STATUS
Most report the campaign state: draft, scheduled, sending, sent.
A campaign still in draft was never scheduled.
COMMON CAUSES
Scheduled and not confirmed The account hit a plan sending limit The account is under review, which platforms do for new senders or unusual activity Payment failed, suspending the account The segment selected contains nobody
THE EMPTY SEGMENT
A filter that matches no subscribers sends to nobody, and the platform reports it as sent.
Check the recipient count before sending.
ACCOUNT REVIEW
New accounts sending their first large campaign are frequently reviewed before release.
That is normal. Respond to whatever they ask for.
PLAN LIMITS
Free tiers have monthly send limits. Exceeding one stops the campaign partway.
Check your usage against the limit.
WHAT TO DO
Read the platform's status and any notification. The answer is usually stated.
If it sent partially, establish who received it before resending.
