How do I fix "501 Syntactically invalid HELO argument(s)"?

email exim
Ranguard picture Ranguard · Sep 17, 2008 · Viewed 23k times · Source

I'm using exim on both the sending and relay hosts, the sending host seems to offer:

HELO foo_bar.example.com

Response: 

501 Syntactically invalid HELO argument(s)

Answer

benefactual picture benefactual · Sep 17, 2008

Possibly a problem with underscores in the hostname? http://www.exim.org/lurker/message/20041124.113314.c44c83b2.en.html

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