Confirm the news is yours to mention
Use information they shared publicly or that you were told you may discuss. Do not reveal a pregnancy, marriage, job, health update, or address before the person has announced it.
Keep the milestone at the center
Name what you are happy about and one sincere reason it fits what you remember of them. Avoid spending most of the message apologizing for the years apart.
Let reconnection remain optional
You may say you would enjoy catching up sometime, but do not attach a referral, invitation, or emotional debt to their celebration. One warm note is complete on its own.