3 people at my office send me messages from their iOS device. If I read and reply from my iOS device, all works well. If I read and reply from my Mac, the replies get mixed and and the wrong person receives it. I have each set up in my Contacts with unique mobile numbers, but identical work numbers.

Any ideas? I have resorted to deleting the coworker who receives the messages from my iPhone and laptop contacts, but that doesn't feel like a long-term solution. Firing him does, I'll look into that for sure...

  • I also have this issue.
    – jhourback
    Commented May 3, 2018 at 21:31

2 Answers 2


At the top of the conversation of the Messages app the contact should be listed under the To: header. You can use the arrow by the name to select more details and change which number you are replying to.

As an alternative you could delete their work numbers, or put it in the notes section of the contact to prevent Messages from mixing them up.

It's best to delete the conversation and start a new one after making changes like these to make sure that messages is using the proper contact info.

  • I'll try adding the co-worker back with his iPhone number only, see if that cures it. Thanks for the clarity.
    – Gary D
    Commented Jan 5, 2018 at 3:17

I had this exact problem. Do you have a common contact detail between the two contacts? If so, this interferes with messages on OS X for some odd reason. Delete the duplicate number and restart your messages app.

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