In version 7.2.3 with smtputf8_enable = no sends the message in queue in cycle:
Jan 25 16:29:27 pmg postfix/smtpd[502239]: connect from localhost.localdomain[127.0.0.1]
Jan 25 16:29:27 pmg pmg-smtp-filter[501796]: smtp error - got: 555 5.5.4 Unsupported option: SMTPUTF8#012
Jan 25 16:29:27 pmg...
hi, here is:
Delivered-To: receiver@domain.ltd
Return-Path: sender@mail.ru
Received-SPF: pass (mail.ru ... _spf.mail.ru: 45.84.128.13 is authorized to use 'sender@mail.ru' in 'mfrom' identity (mechanism 'ip4:45.84.128.0/23' matched)) receiver=pmg.domain.ltd; identity=mailfrom...