are these mostly spamming ways to use the helo ?

>  In:  HELO ARennes-204-1-7-170.w81-53.abo.wanadoo.fr
>  Out: 554 <ARennes-204-1-7-170.w81-53.abo.wanadoo.fr>: Helo command
rejected:
>      ACL helo_hostnames_regexp  HELO/EHLO hostname must not contain an IP
>      address, HELO =  arennes-204-1-7-170.w81-53.abo.wanadoo.fr


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