# How a message is attributed to a chat **URL:** \ **Category:** Uncategorized\ **Created:** [February 12, 2021, 11:26pm UTC](https://forum.delta.chat/t/how-a-message-is-attributed-to-a-chat/1481 "2021-02-12T23:26:55Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![link2xt](https://forum.delta.chat/user_avatar/forum.delta.chat/link2xt/32/1971_2.png) [@link2xt](https://forum.delta.chat/u/link2xt)\ **Post date:** [February 13, 2021, 11:14pm UTC](https://forum.delta.chat/t/how-a-message-is-attributed-to-a-chat/1481/9 "2021-02-13T23:14:07Z")
> [@Hans1](#): > > What I observe is, that getting multiple messages from the same person, sent with delta chat, but probably written from the scratch to my contact, not written as a direct answer from within an existing chat with me, it is displayed in a new chat on my side. Are these messages sent to a group? If they are assigned to a new group each time, then one of the email providers (either yours or the other side) strips the Chat-Group-ID from emails and Message-ID. This is a typical behavior of outlook/hotmail: [Problem in using hotmail.com/outlook.com](https://support.delta.chat/t/problem-in-using-hotmail-com-outlook-com/242) > What causes a change of setup on the sender’s side? This means that Autocrypt header has changed. Probably you have received a message with Autocrypt header, and then without Autocrypt header (because it was removed by the email provider). > I looked into the header and found not many of the Id’s, mentioned in Your list of criterions: If Message-Id is not of the form `Gr.something.somethingelse@example.com` or same but with `Mr.` prefix, then some provider is rewriting Message-IDs. If there is no Chat-Group-ID in the message sent to the group, then provider also removes this header. Also there must always be an Autocrypt header in messages sent by Delta Chat. --- _[View the full topic](https://forum.delta.chat/t/how-a-message-is-attributed-to-a-chat/1481)._