I seem unable to reopen #1049 (closed) so here's a new one instead for my new comment.
I've created another (non-committer) Eclipse Account Ed Willink 2 that routes direct to Gmail, but it seems that I cannot use that account with GitLab; there is no create Gitlab account option; signing in takes me direct to my existing account.
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I'm guessing that the issue is while you've signed out of Gitlab that 'signout' doesn't propagate to accounts.eclipse.org, so your account is still 'logged in'. As such when you click the signin button, Gitlab queries accounts, confirms you're logged in and goes from there.
You should be able to sign out completely by visiting https://accounts.eclipse.org and clicking the 'logout' link in the upper right corner of the page.
The EF portal login/out works for Bugzilla and the Forums, but gitlab obstinately uses Ed Willink rather than Ed Willink 2 so I continue to be unable to attempt to create an alternate notification path.
mailing lists are still a problem. Only Ed Willink 2 receives cross-project-issues-dev although the feed does notify me of content although, different bug, the feed content is useless.
If the goal was to test your email provider is there a reason you didn't just change your email address via accounts.eclipse.org rather than setting up a new account? That process is fairly robust and should update all of the services (mailing lists,bugs,wiki etc).
Just for grins I've verified that your new account can login and access Gitlab, although it seems to have limited permissions. We've sent you a new password.
Based on the data he sent, to me it looks like the issue is somewhere between his mail re-director service(which shows traffic from gitlab@eclipse.org) and client.