Hello, On 2021-08-09, at 16:33 (UTC+0200), Matus UHLAR - fantomas had the following to say:
: I don't know where you got that address is not allowed in helo/ehlo - it is. The (current) standard says that it is for EHLO and it is not for HELO [1]. Thanks, Mono [1] https://datatracker.ietf.org/doc/html/rfc5321#section-4.1.1.1
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