Miss You eCard

Say what specifically you miss rather than that you miss them generally. A particular thing (their cooking, walking somewhere together, the way they tell a story) makes the feeling concrete and gives them something warm to picture.

Avoid anything that reads as a complaint about how long it has been.

Keep it about your experience and attach no request. "I was thinking about you today" and "why have you not called" come from the same feeling and land completely differently: the first is a gift, the second is an invoice.

If you want to see them, ask for that separately and clearly rather than implying it.

Yes, and that is how it is most often used. Missing people is not exclusive to romance: friends who have moved, siblings in other countries, a parent you do not see enough.

Because the message is yours to write, the card takes whatever tone the relationship needs.

Lead with warmth and skip the apology for the silence. Long gaps in contact are usually mutual and rarely anyone's fault, so an opening that does not require them to explain themselves makes it much easier to reply.

One specific memory and a genuine "I would love to catch up" is enough.

Yes. It is one of the few formats that puts something in their hands from another country instantly.

The reveal gives them something to do rather than read, the audio clip lets them hear your voice, and it arrives the moment you send it rather than a fortnight later.

Send it when you are actually thinking about them, which is what makes it worth receiving.

If they are in another timezone, aim for their morning or evening rather than the middle of their working day, so they have a moment to open it properly.