Each inbox you send from needs its own sign-in

Yes, as long as each account is connected on its own. A tracker sits on top of a Gmail account, and Google treats every account you sign in to as separate. Its Google Account Help page on multiple accounts says you can be signed in to several at once and switch between them, and that each keeps its own settings. So the useful question is how many inboxes you send from, and whether every one of them is connected. The answer is getting more important, because Google is changing how one Gmail inbox can stand in for other addresses.

Three ways one person ends up with several senders

• Separate Google accounts in one browser. A personal Gmail and a company Google Workspace account, signed in side by side and switched from the profile picture. Google notes that your default account is usually the one you signed in with first.
• Separate Chrome profiles. Google's Chrome Help page on profiles recommends them for keeping work and personal accounts apart, with separate bookmarks, history, passwords and other settings. Browser extensions live inside a profile too, so each profile needs its own install.
• Extra addresses inside one account. Gmail's Send mail as feature lets one account send from up to 99 addresses you own, picked in the From line. Google warns that Outlook recipients may see your Gmail address shown as sending on behalf of the other one, and that replies go to your original Gmail address unless you change the reply-to address.

The first two are separate mailboxes, and a tracker has to be connected to each. The third is one mailbox wearing several names, and that is the one Google is changing.

What changes in January 2027

Google's notice on third-party account support says that starting January 2027, Send as will stop working for non-Google addresses such as @yahoo.com or @hotmail.com, on the web and in the Gmail apps. The same page says Gmail-to-Gmail aliases and Google Workspace Send as are not affected. Its timeline calls the second half of 2026 a transition period in which these features still work but Gmail may restrict new configurations. Google's separate page on Gmailify and POP adds that fetching mail from other accounts with POP stopped accepting new users after the first quarter of 2026, and existing users keep it until January 2027.

Mailsuite says the same thing on its own help page about tracking other addresses: today you can pick a Yahoo, iCloud or own-domain address in Gmail's From field and Mailtrack tracks it, and after January 2027 there is no supported way to track those providers from Gmail. That is true of every Gmail tracker, ours included, because the address will no longer be sendable from Gmail at all.

Set it up once, account by account

• List every address you send from and write next to each where it lives: its own Google account, a Workspace alias, a Gmail alias, or another provider reached through Send mail as.
• For anything in the last group, decide before January 2027. Google suggests using the provider's own site or app, a desktop mail client, or the Gmail mobile app. For a work domain, Google also says your administrator can migrate the mail into Google Workspace, which keeps it in Gmail.
• Connect every Google account you send from, in every Chrome profile where you use it.
• Before you write, check the address in the top right of Gmail. With several accounts open, the tab in front of you decides who the email comes from.

Tracking follows the mailbox. An account nobody connected sends perfectly good email that nobody will ever see opened.

How Fast Mail Tracker handles more than one account

Fast Mail Tracker works inside Gmail in Chrome on a computer, and one install can hold several accounts from the same Chrome profile: you add each one from the extension's account menu, and each signs in with its own Google login. Every Gmail tab is matched to its own account's connection, so a send from your personal inbox can never be recorded against your work account. If you send from an account that is not connected, Gmail sends the email normally, untracked, and the extension shows a notice telling you to add that account. Desktop alerts for opens and clicks arrive for every connected account, not only the one you have open.

One limit to know today: a tracked send goes out from the account's own address, so it does not keep an alias picked in the From line. When an email must come from an alias, click the tracking button in that compose window to send it untracked.

Fast Mail Tracker is in early access while Google's security review completes, so places are limited; if you send from more than one Gmail account, the install button below is where to connect the first one.