Re: helo command rejected

[Fred Morris]

Felker has past history with this mailing list and postfix, as well as 
some things related to annoyances like versioning.

Are you on a MUSL libc system?  IIRC there's no support for TCP in
MUSL's stub resolver.  See, for example:
    https://news.ycombinator.com/item?id=28312935

https://news.ycombinator.com/item?id=31067059

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Fred Morris, internet plumber