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# citrix-netscalers
Slackbot
09/04/2023, 10:27 PMThis message was deleted.
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Eirik Vesterhus / Intility AS
09/05/2023, 7:03 AMThat's right. The backend server needs to understand the custom TCP header in order to extract and make use of it - which probably the SMTP server do not.
Other options are USIP and as you mentioned - having the allow list on the Netscaler.
j
Julian Mooren
09/05/2023, 9:51 AMDifferent NetProfiles (if needed for the relay adressing) and ListenPolicy Expressions for SMTP traffic will save a lot of headache and bandwith.
k
Kari Ruissalo (WyW)
09/05/2023, 11:10 AMIf it's an option, I'd just do the whitelisting on the NetScaler. Ofc you need to consider that it supports your production, so that all the necessary ppl are able to control the whitelist.
p
Preston Gallwas (Atum)
09/11/2023, 8:51 AMAllow list on netscaler, this is the way.
Preston Gallwas (Atum)
09/11/2023, 8:52 AMCommand policy and nitro api wee gui powershell app to allow normal folk to have a go
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