Sending emails on Pixel 6

[kewisch]

Error Sender refused

Confirming the issue is indeed It turns out the issue is SMTP: "HELO can't be [127.0.0.1]" · Issue #6327 · thunderbird/thunderbird-android · GitHub . They have restricted 127.0.0.1 as the EHLO IP address. If you need an argument for support, the approach they are taking is not standards compliant. RFC 5321 specifically says: An SMTP server MAY verify that the domain name argument in the EHLO command actually corresponds to the IP address of the client. However, if the verification fails, th…

Please give 11.0b5 a try, we changed something that might work around the problem.