Shields, Rusty (IMS):
> Apr 14 17:22:57 tilapia postfix/smtp[19383]: 8F27A27954:
> to=<hama...@imsweb.com>, relay=mailrelay.imsweb.com[204.132.58.6],
> delay=0, status=bounced (host mailrelay.imsweb.com[204.132.58.6]
> said: 554 Format restriction violation. Email Session ID:
> {4DA765B1-6-6565EC3F-FFFF} (in reply to end of DATA command))

According to RFC 5321, the Internet mail protocol definition, the
remote SMTP server at 204.132.58.6 replies at END-OF-DATA with "554
Format restriction violation".

According to RFC 5321, the Internet mail standard, this means that
the remote SMTP server at 204.132.58.6 does not accept the message.

If the remote SMTP server at 204.132.58.6 delivers that message
anyway, then that server does not implement the Internet mail
protocol correctly.

        Wietse

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