SMTP outgoing errors on all accounts

[NWTSCL]

I have been receiving SMTP outgoing errors with every account that I have: Gmail, Outlook, Hotmail, Yahoo. And every attempt to set up a new account in AquaMail stops with the same SMTP errors.

Android 7.1

[NWTSCL]

Are you using a wifi connexion in a hotel/company or similar? There could be limitations to send (smtp) messages in your (mobile or wifi) network.

No.

[NWTSCL]

The problem is happening on a Pixel XL. Interestingly enough, SMTP works just fine with the same settings, same network on a Nexus 6P with Android 7.0.

So the problem seems related to AquaMail with Pixel XL and/or Android 7.1

[Kostya Vasilyev]

Well, I've got a Nexus 5x here, with 7.1, no trouble with SMTP at all.

Can you please check if you've got app settings -> network -> SSL hardening enabled on the Pixel? And turn that off if it is?