Glossary
MailTip
A short notification shown to email senders before they send — about recipient status, group size, external sharing, etc.
A MailTip in Exchange Online is a short notification shown to email senders before they send — about recipient status, group size, external sharing, or organisation-specific advisory. Built-in MailTips include: "This recipient has Out-of-Office set," "This group contains 5,000 members; consider sending to a smaller group," "This message contains external recipients," "This mailbox is full and can't receive new messages." Custom organisational MailTips can be configured per recipient — useful for VIP accounts, legal alerts, or specific guidance. MailTips appear in Outlook compose pane and on web Outlook before send, giving users a chance to reconsider problematic emails before they go out.