: SMTPUTF8 is required, but was not offered by host mta7.am0.yahoodns.net

stefan1959 · January 7, 2025, 10:16pm

SYSTEM INFORMATION
OS type and version	Rocky Linux 9.5
Usermin version	2.102
Virtualmin version	7.30.3 Pro
Theme version	21.20.7
Apache version	2.4.62
Package updates	All installed packages are up to date

I just testing a domain that mail is working ok.
I test to gmail account with no issues but when I send to yahoo.com I get a bounce with that error.

I’m looking for a solution, maybe its a yahoo bug, not sure.

P.S.
I was testing within virtuamin using the compose in the edit user section. If I use thunderbird the email is delivered ok.

Steini · January 8, 2025, 4:46pm

Have you tried disabling/enabling the feature in your /etc/postfix/main.cf?

What’s the outcome if you set smtputf8_enable to no?
What’s the outcome if you set smtputf8_enable to yes?

stefan1959 · January 8, 2025, 8:39pm

I think I tried that and it caused a issue, I’ll try again later.
Its only happens inside virtualmin via the edit user section, not with a email client so I’m not to worried.