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Email Authentication and Handling Unsolicited Emails in Gmail Inbox

We daily receive emails from known and unknown sources. So, it is essential that we understand the risks involved in handling emails in terms of identifying them and thereafter knowing how to best deal with the threats posed by the malicious ones. The Gmail spam and abuse detection algorithm use multiple signals such as Google's internal algorithm, blacklists, and crowdsourcing among other unknown factors Google doesn't make public to identify incoming messages and help the users on this front.  However, the spammers are extremely smart, and they can find ways to escape the algorithm through innovative ways. This is why, even with an effective spam and abuse detection system in place, one needs to be aware of some essential details so as to remain vigilant while handling emails, should there be a false-negative one. Everyone knows about Spam, Spoofed, and Phishing emails (among others) and they are the common types of unsolicited emails we receive in our addresses. Determining...

How did this email reach my Gmail address?

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...

Using the IMAP protocol to import emails from another domain to Gmail (and vice-versa)

We routinely receive questions in the Gmail Help Community on how to bring over emails from other email service providers, and in some cases, the other provider may not support POP3 or is not supported by Gmailify or the ShuttleCloud API or may experience a known issue. For those circumstances, the most convenient method would be to use an email client like MS Outlook, Thunderbird, Mac or Apple Mail and follow the steps suggested below: Setup both the accounts as using IMAP. Allow the email client to download emails from both accounts. Set up the necessary folders in the destination account (in this case Gmail), which will show up as labels in the Gmail web UI. Move, Copy or Drag 'n Drop emails from the folders/inbox of the source account to the folders in the destination (Gmail) account. When your destination (Gmail) account in the email client syncs with the server, it would show the emails from the other account. Note:  This is a manual process so it needs to be performed perio...