I think IOS v14 changed to sending using that EHLO, it may have changed in the 
latest update as far as I am aware, I haven’t followed it extensively, but 
picked up on it reading various threads, I don’t think its Malware.

JD

> On 2 Oct 2020, at 21:13, Eric Tykwinski via mailop <[email protected]> wrote:
> 
> Just had a client try to send emails from an iPhone using “EHLO 
> localhost.localdomain” which we have blocked.
> I’ve never seen this before ever, so just checking if there is something new 
> out there.
>  
> Sincerely,
>  
> Eric Tykwinski
> TrueNet, Inc.
> P: 610-429-8300
>  
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> [email protected] <mailto:[email protected]>
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