Amazon SES for STMP - UTF8 error


When we add a special character in the title of an email (like New fax Received), Amazon SES will not process/send the message, and return this error message:


Action: failed
Status: 5.6.7
Diagnostic-Code: X-Postfix; SMTPUTF8 is required, but was not offered by host

For example, the title that was giving the error was:

If I replace the “ç” with a “c”, the email is accepted and processed by Amazon SES.
Email body with special characters are totally fine though.

Thank you for considering this issue for the next release of VitalPBX.

What version of VitalPBX is this?

VitalPBX v4.1.0-1
PBX Engine 18.22.0-1

Try executing the commands below using root privileges.

postconf "smtputf8_enable = yes"
postfix reload

@miguel Thnak you for your suggestion.

Unfortunately it didnt work. Issue persist.
I tried a full reboot as well. No luck.