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After moving to another host my site stopped sending E-mails (UTF-8 HTML). But I'm still able to send text emails like these:

echo test | mail -t me@example.com -s test

php -r 'mail("me@example.com", "test", "test")'

Where should I look for details of this behavior?

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Digging in /var/spool/mail made it clear with bounce message:

SMTPUTF8 is required, but was not offered by host mxs.mail.ru [94.100.180.31]

So I've had to add the line smtputf8_enable = no to the /etc/postfix/main.cf to make HTML e-mails go

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