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by carl689 4838 days ago
Perhaps I am not following 100%, but I believe we have done this without this issue for years with google apps.

We have one primary domain and 15 alias domains. Email Example: user@alias.com gets an email, when they reply it stays set to the alias, it doesn't change to the primary domain.
1 comments
csixty4 4838 days ago
Gmail sends a Sender: header with the account's primary email address, which some email programs treat as the "actual" sender. Some mail programs display this as "From alias@example.com on behalf of primay@example.net" and then those programs use the primary as the return address.

According to Google, they don't include this header if you upgrade to Google Apps for Business.

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