dovecot warns (non-fatal) "invalid EHLO response line: Unexpected character in EHLO keyword" connecting to submission relay ?

[PGNet Dev]

On 9/26/20 6:45 AM, Alec Moskvin wrote:
>> what's specifically invalid about
>>
>> 	250 mail.messagingengine.com PIPELINING SIZE 73000000 AUTH DIGEST-MD5 CRAM-MD5 NTLM LOGIN PLAIN AUTH=DIGEST-MD5 CRAM-MD5 NTLM LOGIN PLAIN ENHANCEDSTATUSCODES 8BITMIME
>>
>> by dovecot's 'measure'?
> 
> The "=" in AUTH=PLAIN.
> 
> See: https://dovecot.org/pipermail/dovecot/2020-September/119854.html
> 
>      $ openssl s_client -connect smtp.fastmail.com:465
>      ...
>      220 smtp.fastmail.com ESMTP ready
>      ehlo asdf
>      250-smtp.fastmail.com
>      250-PIPELINING
>      250-SIZE 71000000
>      250-ENHANCEDSTATUSCODES
>      250-8BITMIME
>      250-AUTH PLAIN LOGIN
>      250 AUTH=PLAIN LOGIN
> 

ah!  I'll take it up with fastmail.  thx!