Looks like the 4th bullet point applies here. Whoever admins that mail server needs to fix the config so it uses a real host/domain name in the HELO command, not "popimap02.icare.priv"
You shouldn't be dumping mails based on the contents of HELO though, should
According to the RFCs, no. But then, at one point not long ago, every mail server was an open relay, and would accept and forward mail sent by anyone to anyone, which was also what the RFCs specified.
The majority of attempted network connections are malicious nowadays, thanks to spammers and viruses, which makes strict RFC compliance undesirable...
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