Is Trelson Mail Switch safe?

Clean risk

Trelson Mail Switch redirects Gmail compose links and recipient fields to a configured webmail endpoint.

When enabled for a paid account, Trelson Mail Switch watches Gmail navigation and rewrites compose or mailto links to open in Outlook Web Access or another configured webmail instance. The redirected URL carries recipient values such as to, cc, and bcc so the new compose window can be prefilled.

Trelsonv2.2.5Chrome Web Store
0Risk
Who publishes it

Trelson AB - 1 other listing from the same operator, none carrying a finding

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
Trelson
Declared legal entity
Trelson AB
Registered address
Mejerivägen 3, Stockholm 117 43, SE
Registered contact
Trelson AB

Same store account

1 other listing published from this account, 30k+ users between them, none of them carrying a finding.

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Where it sends data

Destinations our analysis observed Trelson Mail Switch contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • outlook.office.com/owa/

    Trelson Mail Switch sends data to outlook.office.com/owa/. No other extension we have analysed sends data here.

Updated 30 September 2026ddcmlceaelochmiiaicdhcehidcfbklg