J Doe skrev den 2017-09-27 22:20:

[snip]
Is there a way to achieve this or as you noted, are whitelists to be
avoided ?  If whitelists are to be avoided what is the best practice
for handling this scenario ?

why not add example.org on google apps mx ? :=)

if useers not wanting your mailserver anyway, why even think about imap then ?

still serious ?, then setyp postfix client sasl auth to gmail pr user

if not want all that problems drop forwards

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