[Users] [Bug 4826] New: SMTP error from remote server // mail header

[noreply at thewildbeast.co.uk]

https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4826

            Bug ID: 4826
           Summary: SMTP error from remote server // mail header
           Product: Claws Mail
           Version: 4.3.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Other
          Assignee: users at lists.claws-mail.org
          Reporter: mail at heimbuero.net

Created attachment 2509
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https://www.thewildbeast.co.uk/claws-mail/bugzilla/attachment.cgi?id=2509&action=edit
configuration scrrenshot

Hello,

I receive the following error when sending an email to the domain @icloud.com

SMTP error from remote server for TEXT command, host: mx02.mail.icloud.com
(17.57.155.25) reason: 554 5.7.1 [CS01] Message rejected due to local policy.
Please visit https://support.apple.com/en-us/HT204137

Is it possible that it is due to the custom header?
I have set it to User-Agent. Which configuration is RFC conform. Should I
enable "Send mail adress in message ID" and/ or "insert header for user-agent"?

PS:
Sending mail from iPhone (apple mail) to same receiver works without SMTP
error.

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