It was working few days ago. /etc/hosts looks ok, sendmail does restart without any errors, telnet is successful. 原因1）の場合. Postfix構成の問題（送信者アドレスのドメインが存在しない） Workaround. 553 #5.1.8 Domain of sender address does not exist (in reply to MAIL FROM command)) Why does it always try to send from and how can I stop it? In main.cf: telnet で 接続して その log を 見てみましょう. mailx giving error domain of sender do not exists - UNIX Probably they are performing the test by trying to resolve it to an IP address, which will fail. 12-10-2019 09:56 AM. I need help on this one. All mail sent out via PHP is marked with the Return-path of accountname@server.domain.com. Domain of sender address ... does not exist case 004 ruleset=check_mail reject=553 5.1.8. 553 5.1.8 ... Domain of sender address postmaster@dominio5.com.mx does not exist. SMTP error from remote mail server ... Domain of sender address ... telnet で 接続 . For further assistance, please send mail to If you do so, please include this problem report. Der Fehler tritt nur bei wenigen Empfängern auf. Domainname: lankheet.com Hostname: keet.lankheet.com -----Oorspronkelijk bericht----- Van: fedora-list-bounces redhat com … 553 #5.1.8 Domain of sender address does not exist. Sender Verification, "envelope Senders whose domain does not … Anyway, did you try to send an email to user@localhost and see what happens.

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