These days people have multiple email accounts, so, one of the common questions posed in the Gmail Help Community is often about "How did this email, that was intended for my account X, reached my Gmail account?" The common reasons which can cause this to happen are: Emails are forwarded from the account X to the Gmail account Emails are fetched via POP3 from account X by the Gmail account Emails are fetched via the Gmailify option from account X by the Gmail account Emails are fetched via the ShuttleCloud API from account X by the Gmail account The Gmail address is listed as a Reply-to address in account X The Gmail address is included as a BCC recipient in the email For anyone inconvenienced by this issue, the most accurate way is to analyze the header of the message they received in their Gmail address. The header lists the machines (or servers) that a message had to pass through before reaching the recipient’s mailbox thereby providing a log of how it ended up
I'm a Diamond Product Expert for Gmail and Google Accounts and this blog includes articles in English, Bengali and at times Hindi on new Gmail and Google Accounts feature launches or changes, Workarounds or explanations on issues affecting the users in the Gmail and Accounts Help Communities and documenting instructions I do not find in the Help Center articles.